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

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Old 06-28-2009, 10:27 AM   #26
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Have you done a mpg comparison yet? I'd be interested to know what effect this has on gas mileage.
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Old 06-28-2009, 12:38 PM   #27
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I have not as of yet...can't keep my foot out of it long enough to get a fair comparison...but generally speaking I would expect a little better mpg with headers and CAI, as you are improving the efficiency of the pump (ie motor).
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Old 06-28-2009, 03:07 PM   #28
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looks good, how about the sound?
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Old 06-28-2009, 03:44 PM   #29
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Great video
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Old 06-28-2009, 04:10 PM   #30
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I'm glad the the hard parts guys are saying the TRUTH, I hope the guys with new Camaros understand that the STOCK Camaro mufflers FLOW REALLY well. They look like suit cases and are heavy as hell but they do FLOW air thats for sure.

Power is made by ARH tubes and COLLECTORS, thats old school guys...

Question for the OP, Stock or race cats?


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Old 06-28-2009, 04:46 PM   #31
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is this system availble without cats?
yes it is
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Old 06-28-2009, 05:29 PM   #32
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very nice sound. did i here 2 gear chip of the tires.
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Old 06-28-2009, 05:57 PM   #33
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I'm glad the the hard parts guys are saying the TRUTH, I hope the guys with new Camaros understand that the STOCK Camaro mufflers FLOW REALLY well. They look like suit cases and are heavy as hell but they do FLOW air thats for sure.

Power is made by ARH tubes and COLLECTORS, thats old school guys...

Question for the OP, Stock or race cats?


-bobby
ARH uses only the highest flow cats available...so yes, I would consider them RACE cats.
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Old 06-28-2009, 05:58 PM   #34
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very nice sound. did i here 2 gear chip of the tires.
lol...and yes you did. Shifted the rear end over about 2 feet on the 1-2...FINALLY!!!
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Old 06-28-2009, 06:17 PM   #35
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looks good, how about the sound?
Sounds super quiet at idle...still to quiet for me, but my wife likes it.
Sounds pretty mean at WOT. Its really a very nice compromise, and seems to flow very well with stock mufflers. I don't know now quiet it will be with a cam, but I guess i'll find out pretty soon.
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Old 06-29-2009, 04:22 PM   #36
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Brad... I'm so freakin' jealous!!!

Andy... sweet exhaust dude! :jawdrop:
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Old 06-29-2009, 08:24 PM   #37
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Brad... I'm so freakin' jealous!!!

Andy... sweet exhaust dude! :jawdrop:
What up man! Your ride is sick tho...how you like it with the heads on there?
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Old 06-29-2009, 08:54 PM   #38
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What up man! Your ride is sick tho...how you like it with the heads on there?
It runs pretty good with them. Better than I was expecting honestly.. If I get lucky and get a negative DA (-500ish) day @ the track again, I'm in the 11's without a doubt.

Last year after my PB, I ran again in June on a 2k DA day. Only managed a 12.8@106, just horrible. 2600DA ... Ran in 3000DA @ the TBSS Nat's and ran a 12.45@110 ~ pulling pretty good on the big end .

Using these "fuzzy" numbers, I'm probably good for an 11.8 as it sits. Maybe even an 11.7 ..... hoping for a 10 on a 150 shot. And a new bottom end soon after!
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Old 06-30-2009, 06:40 AM   #39
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It runs pretty good with them. Better than I was expecting honestly.. If I get lucky and get a negative DA (-500ish) day @ the track again, I'm in the 11's without a doubt.

Last year after my PB, I ran again in June on a 2k DA day. Only managed a 12.8@106, just horrible. 2600DA ... Ran in 3000DA @ the TBSS Nat's and ran a 12.45@110 ~ pulling pretty good on the big end .

Using these "fuzzy" numbers, I'm probably good for an 11.8 as it sits. Maybe even an 11.7 ..... hoping for a 10 on a 150 shot. And a new bottom end soon after!
Cool man, can't wait til fall and we can hopefully see some fast times...this horrible summer weather sucks. I'm kinda glad I kept my heads, I'm re-using them on my new shortblock (saved me $$$ over having to buy trickflows).
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Old 07-24-2009, 08:01 PM   #40
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We dyno'd the SS last night after installing the American Racing (Catted) system with stock mufflers. For comparison, we used my BEST stock dyno run...I certainly "could" have picked my worst stock dyno to make the gains look better and if I were selling a product that probably would be smart, but I'm "keeping it real" so you know what it really did. (all numbers are SAE corrected, Same dyno for all pulls).

My best dyno stock was 321rwhp/332rwtq, by best with headers + tune was 350rwhp/370rwtq for gains of 29rwhp at peak/38rwtq at peak.

At its maximum gain over stock it picked up 42rwhp @ like 5300rpm and 42rwtq @ like 4200 rpm.

I will put some sounds clips up soon. It is as quiet as stock with the cruise set @ 80 mph, but it definitely wakes up at WOT.

On my auto we didn't see the 50rwhp/45rwtq that was claimed (which I assume was on a 6sp manual car). However, if you figure dyno variation, weather differences between stock and modded pulls, and the different amount of power gained between manual and auto, I think my numbers are in-line with the advertised claims.


ADDED: video of 0-60 run after mods:

Did you do a tune with this as well?
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Old 07-24-2009, 08:38 PM   #41
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this tune from pcmforless started at 305/ 300 and went up to 327/ 342, your L99 was already up 10 hp and 15 torque, another dyno on the site from ADM said cat back only added about 3 hp when added after tune?
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Old 07-24-2009, 10:18 PM   #42
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this tune from pcmforless started at 305/ 300 and went up to 327/ 342, your L99 was already up 10 hp and 15 torque, another dyno on the site from ADM said cat back only added about 3 hp when added after tune?
I guess I'm confused as to what your question is?
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Old 07-24-2009, 10:23 PM   #43
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Did you do a tune with this as well?
Yes, but it looks as though my car's "factory" tune was pretty much spot on compared to most. Phil (my tuner) said that typically on a stock LS3 there isn't "that" much left in the tune. Sure I could have drove the car in "stock" hot right off the road and dyno'd it (taking the lowest dyno pull), then let it set for and hour and a half tune'd it, dyno repeat, dyno repeat etc and take the best pull...which is what some shops do in an effort to make their numbers look better....we didn't do that, we did hot pulls and took the best stock vs the best tuned/headers...they were all "hot" pulls...so yes, those gains include a tune (which is almost always necessary to get the most power out of any performance parts that are added).
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Old 07-25-2009, 10:01 AM   #44
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as with everyone else on forum I am trying to determine what is best, if tune alone gets 23 HP/ 42 ft. lb. torque, will exhaust do more? what about CAI? it appears that a tune plus exhaust is only 3 to 5 HP more than tune alone. I am waiting also to see mpg improvement from tune. All I have observed is tune @ $300 to $650 = 23 hp/ 42 TK, tune plus exhaust = $2000 to $2500 for 3 to 5 HP, same torque. We are all in a learning curve, there are very few of us out there, all trying to get the most out of a great car. Will I try an exhaust? Yes, once I hear all of them, probably shorty headers (PA), CAI? want to see numbers, but could be best bang for the buck, now which one?
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