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Old 12-31-2011, 06:53 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, 07:33 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, 07:44 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, 08:08 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, 08:11 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, 12:26 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, 12:36 AM   #7
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Old 01-01-2012, 12:37 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, 12:42 AM   #9
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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.
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, 12:55 AM   #10
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Quote:
Originally Posted by Supercharged SS View Post
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, 01:25 AM   #11
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Quote:
Originally Posted by Ratt View Post
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, 01:35 AM   #12
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Quote:
Originally Posted by Supercharged SS View Post
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, 02:48 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, 02:56 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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