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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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Old 12-31-2011, 07:53 PM   #1
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Quick Question for L99

I have had my car for 13 months now and now i feel its time for me to start my mods. I like the Kooks headers w/ Magnaflow exhaust set up. Does anyone have this? If yes how do you like it and does your exhaust add HP?
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Old 12-31-2011, 08:33 PM   #2
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The exhuast will add a few hp (5 or 10 hp) but you will get a good about of hp gains from the Longtube headers (around 30hp)
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Old 12-31-2011, 08:44 PM   #3
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You'll need a tune to maximize the performance of the headers. Something to keep in mind. Also do you have an intake?
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Old 12-31-2011, 09:08 PM   #4
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Don't get fixated on HP numbers.

You'll need a tune. Expect maybe 20-30rwhp with a tune.

What's really going to open your car up though is tuning the transmission.
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Old 12-31-2011, 09:11 PM   #5
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The numbers would be mitigated a bit by the extra DT loss but you'll feel a difference even if just slight.
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Old 01-01-2012, 01:26 AM   #6
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The headers will get you between 30 and 40 rwhp depending on the size and brand with a tune. The exhaust will give you sound only.

If your going to get it tuned you might as well spend $600 to $700 on an air intake, throttle body and washer bottle replacement. That will get you about 50 to 60 rwhp total.
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Old 01-01-2012, 01:36 AM   #7
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Old 01-01-2012, 01:37 AM   #8
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Add a Vmax TB to your mix before U get that tune!! L99 throttle response is better with one!
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Old 01-01-2012, 01:42 AM   #9
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The headers will get you between 30 and 40 rwhp depending on the size and brand with a tune. The exhaust will give you sound only.

If your going to get it tuned you might as well spend $600 to $700 on an air intake, throttle body and washer bottle replacement. That will get you about 50 to 60 rwhp total.
This is wishful thinking. As for rwhp L99 gains...expect about a 30-35 rwhp with the addition of LT's, high flow cats, a cai, and a tune. IE, my car in 2009 made 333 stock, 368 with these mods. It's a proven fact. All of these cars are similar in gains.
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Old 01-01-2012, 01:55 AM   #10
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This is wishful thinking. As for rwhp L99 gains...expect about a 30-35 rwhp with the addition of LT's, high flow cats, a cai, and a tune. IE, my car in 2009 made 333 stock, 368 with these mods. It's a proven fact. All of these cars are similar in gains.
I got 382 rwhp with ARH 1 7/8 headers with cats, CAI air intake, Vmax throttle body and roto fab washer bottle replacement with a ram air scoop. Borla S exhaust for sound. 334 rwhp was my base. The shop who did my tune said they have gotten more than 382 on some L99's with similar mods.
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Old 01-01-2012, 02:25 AM   #11
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I got 382 rwhp with ARH 1 7/8 headers with cats, CAI air intake, Vmax throttle body and roto fab washer bottle replacement with a ram air scoop. Borla S exhaust for sound. 334 rwhp was my base. The shop who did my tune said they have gotten more than 382 on some L99's with similar mods.
I'm not looking for an argument here. There are always exceptions to the rule but the majority fall into the category I mentioned. So your car at the track did what, had to be a very low 12.
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Old 01-01-2012, 02:35 AM   #12
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I'm not looking for an argument here. There are always exceptions to the rule but the majority fall into the category I mentioned. So your car at the track did what, had to be a very low 12.


So many L99 owners get traumatized with their rwhp. What they forget is that an auto transmission tuned correctly is a huge advantage over a manual transmission. Computer shifting never misses. Humans err.
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Old 01-01-2012, 03:48 AM   #13
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I have the exhaust setup you are asking about and with mods in sig I made 360ish RWHP in 100 degree heat. I dont know my before baseline #'s though so I cant tell you what the actual gains were. I can tell you you are going to want a quality CAI and tune to go along with the headers though. As far as sound goes it is a mellow deep throaty sound at idle and light throttle (maybe just a bit louder than a stock LS3 car) but earth shaking at WOT. It is probably one of the quietest setups at idle that you can get with Long tube headers. BTW, It is of my opinion that every L99 car should have CAI, long tube headers, and a tune done at minimum. It makes the automatic 2010+ V8 Camaro the car it should have been from day 1.
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Old 01-01-2012, 03:56 AM   #14
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Quote:
Originally Posted by Ratt View Post
The headers will get you between 30 and 40 rwhp depending on the size and brand with a tune. The exhaust will give you sound only.

If your going to get it tuned you might as well spend $600 to $700 on an air intake, throttle body and washer bottle replacement. That will get you about 50 to 60 rwhp total.


It depends on the CAI of course.

Quote:
Originally Posted by VADER SS L99 View Post
I have the exhaust setup you are asking about and with mods in sig I made 360ish RWHP in 100 degree heat. I dont know my before baseline #'s though so I cant tell you what the actual gains were. I can tell you you are going to want a quality CAI and tune to go along with the headers though. As far as sound goes it is a mellow deep throaty sound at idle and light throttle (maybe just a bit louder than a stock LS3 car) but earth shaking at WOT. It is probably one of the quietest setups at idle that you can get with Long tube headers. BTW, It is of my opinion that every L99 car should have CAI, long tube headers, and a tune done at minimum. It makes the automatic 2010+ V8 Camaro the car it should have been from day 1.
Typically on an L99 it's between 325 and 330 RWHP on a dynojet so your estimated gain of 30 to 35 is right in the ballpark but who knows? Different days, different dynos, different conditions.
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Old 01-01-2012, 04:52 AM   #15
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I'm not looking for an argument here. There are always exceptions to the rule but the majority fall into the category I mentioned. So your car at the track did what, had to be a very low 12.
I don't really see an argument. I gained about 48 rwhp. The Jannety air intake test stated I would get 18.6 rwhp with the CAI intake and a scoop. I made my own scoop and to be honest its a little better than the ADM so I might have squeaked out a couple more. That leaves about 28 to 30 rwhp for the headers. 30 rwhp is about standard for any of the top 4 headers companies.

If you call a high performance shop that makes their money from installation and not selling product, most will tell you that you will get an extra 10 rwhp with the ARH header. I have had one on this site tell me this and he didn't push the ARH headers he was just honest. I don't know if you get an extra 10 rwhp with them but you will get 30 rwhp for sure.

I just got it tuned in late November and the track in Granite City IL doesn't open til the spring. I need a set of Nitto street drags but I'm hoping for high to mid 12's
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Old 01-01-2012, 07:21 AM   #16
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I'm not looking for an argument here. There are always exceptions to the rule but the majority fall into the category I mentioned. So your car at the track did what, had to be a very low 12.
With CAI, Shorties, HFC's, a stall, DR's and a tranny tune (only), I can assure you very low 12's are very possible.

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Old 01-01-2012, 08:46 AM   #17
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With CAI, Shorties, HFC's, a stall, DR's and a tranny tune (only), I can assure you very low 12's are very possible.

Padre

I wasn't questioning times. With just 368 rwhp I was able to squeeze a 12.4 @ 113 on the stock tires. I would hope that with the additional rwhp a 12.2/12.1 is possible. Dynos are dynos, the track will show the truth.
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Old 01-01-2012, 02:25 PM   #18
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I don't really see an argument. I gained about 48 rwhp. The Jannety air intake test stated I would get 18.6 rwhp with the CAI intake and a scoop. I made my own scoop and to be honest its a little better than the ADM so I might have squeaked out a couple more. That leaves about 28 to 30 rwhp for the headers. 30 rwhp is about standard for any of the top 4 headers companies.

If you call a high performance shop that makes their money from installation and not selling product, most will tell you that you will get an extra 10 rwhp with the ARH header. I have had one on this site tell me this and he didn't push the ARH headers he was just honest. I don't know if you get an extra 10 rwhp with them but you will get 30 rwhp for sure.

I just got it tuned in late November and the track in Granite City IL doesn't open til the spring. I need a set of Nitto street drags but I'm hoping for high to mid 12's

Calm down dyno queen
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Old 01-01-2012, 11:56 PM   #19
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Calm down dyno queen
I didn't realize I was excited? Maybe it's you, cut back on the hot sauce on your taco's
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Old 01-02-2012, 12:57 AM   #20
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I didn't realize I was excited? Maybe it's you, cut back on the hot sauce on your taco's
Your gains are on a very very giving dynojet.
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Old 01-02-2012, 01:21 AM   #21
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I wasn't questioning times. With just 368 rwhp I was able to squeeze a 12.4 @ 113 on the stock tires. I would hope that with the additional rwhp a 12.2/12.1 is possible. Dynos are dynos, the track will show the truth.
Exactly....Numbers don't mean anything. Dyno's are used for tuning and don't represent true track times. I did 12.5 with CAI,Ported TB, LTs,cats, exhaust, and tune on stock Pzeros. Dyno said about 365 but what was more important was the trans tune. IF you want exhaust sound check out my youtube vids.http://www.youtube.com/user/PvPlugz?feature=mhee
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Old 01-02-2012, 03:03 AM   #22
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Your gains are on a very very giving dynojet.
My gains are a direct result of research from this web site and a Dyno shop that went the extra mile

The Jannetty air intake post and many members who PM'ed me and said I would get more HP with the ARH headers

The Dyno shop I went to kept my car for 5 days then let me drive it for the weekend and then kept it for another 3 days after that. The shop owner let me use one of his cars when I brought it back for the last 3 days because it was raining and I was using my motorcycle to get to work.

The shops name is The Turbo Connection in Edwardsville IL.
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Old 01-02-2012, 06:21 AM   #23
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Exactly....Numbers don't mean anything. Dyno's are used for tuning and don't represent true track times. I did 12.5 with CAI,Ported TB, LTs,cats, exhaust, and tune on stock Pzeros. Dyno said about 365 but what was more important was the trans tune. IF you want exhaust sound check out my youtube vids.http://www.youtube.com/user/PvPlugz?feature=mhee
I agree, I don't really put a lot of stock in any Dyno numbers and this is why.

After the shop had my car for 5 days the rwhp was 378. The shop owner thought he could get another 10 to 20 rwhp more out of it and he wanted to work on some calculations at home. When I brought it back on Monday it was raining and the first pull was 366 rwhp. He kept it for 3 days but is was raining every day. After he pulled and tweaked it all he could it was at 382 rwhp.

After it finally stop raining 4 days later, I took the car out and opened it up. It had a more punch than when I picked it up for the weekend at 378 rwhp. I can't believe 4 more rwhp would be noticeable when your getting on it so I have to think the car has more than 382 rwhp. I don't care about the silly HP numbers, I can't wait for the track to open and get the numbers that really count.

Right now all I have to judge my gains by is when I pulled away from the jerk who lives up the street from me in his Challenger SRT.

Ps. I love that youtube video you posted

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Old 01-02-2012, 07:10 AM   #24
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This is wishful thinking. As for rwhp L99 gains...expect about a 30-35 rwhp with the addition of LT's, high flow cats, a cai, and a tune. IE, my car in 2009 made 333 stock, 368 with these mods. It's a proven fact. All of these cars are similar in gains.
I agree with what this gentleman says and I certainly can't explain it, but with only that miniscule amount of HP, my car improved 1 2/10s seconds and over 6 mph in the quarter with the mods he mentions. My dyno numbers went as high as 371 when LS3s were showing 400- 430 RWHP. However, I run with or ahead of LS3s with the same mods in the quarter mile...go figure! My runs in this video were on stock Pirellis...reaction time on this run was horrible, but my 60' was 1.89. My opponent in this run was an LS3 with almost identical mods.

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Old 01-02-2012, 08:24 AM   #25
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I think the main reason the L99 beats the LS3 is the shift points. If someone knows more about this please chime in.

The tuner for an L99 sets the shift points at the peak HP and TQ of each gear. The RPM's are different for each gear. Someone with a LS3 has a shift light and shifts at the same RPM for each gear.

This is something I was told but I don't know how true it is. Can anyone elaborate on this?
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