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

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Old 04-29-2010, 10:24 AM   #1
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Which would be better exhaust? 2.5" or 3"

Have on order IOM 2SS/RS M6 and wanted to go ahead and get CAI and catback exhaust. With just the CAI which would be better for me? The 2.5" or the 3"? Not sure with just CAI if I would lose performance with back pressure. Trying to decide between Cherry Bomb 2.5" and Flowmaster 3". Any input would be greatly appreciated.
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Old 04-29-2010, 10:51 AM   #2
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cherry bomb exhaust is crap IMO and the flowmaster is not that much better. but they sound okay so if you don't mind having pipes that will eventually rust on the outside as a compromise to price then i would choose flowmaster over cherry bomb. plus the cherry bomb sound will change for the worse over time cuz they use fiberglass filling, flowmaster sound will never change b/c they use baffles.

both are 409 stainless steel and painted black.

if you want quality you need to find an exhaust that is 304 stainless steel.

magnaflow sells both 3" and 2.5" cat-backs
Corsa and Borla only sell 2.5"
MBRP only sells 3"

it has been proven you don't really NEED 3" unless you have a high horsepower vehicle making 500rwhp+
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Old 04-29-2010, 10:55 AM   #3
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i would go with a 2.5" exhaust, only way you should go with a 3" exhaust is if you are running a supercharger. since your not the 2.5" will be fine
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Old 04-29-2010, 12:51 PM   #4
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If your only mildly modifying 2.5 inch is all you need.
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Old 04-29-2010, 12:54 PM   #5
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i always like to think of the 'what if"......go for the 3" and never have to worry about anything else, not like your worse off with teh 3"....who knows what your doing 2-3 years down the line
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Old 04-29-2010, 12:57 PM   #6
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problem with 3" and a stock motor is reduced back pressure creates less torque in the lower RPM range.
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Old 04-29-2010, 01:36 PM   #7
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Quote:
Originally Posted by RedJewel2SS View Post
problem with 3" and a stock motor is reduced back pressure creates less torque in the lower RPM range.
+1 and also with a 3" exhaust you get alot more drone than if you had a 2.5".
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Old 04-29-2010, 04:16 PM   #8
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Quote:
Originally Posted by RedJewel2SS View Post
cherry bomb exhaust is crap IMO and the flowmaster is not that much better. but they sound okay so if you don't mind having pipes that will eventually rust on the outside as a compromise to price then i would choose flowmaster over cherry bomb. plus the cherry bomb sound will change for the worse over time cuz they use fiberglass filling, flowmaster sound will never change b/c they use baffles.

both are 409 stainless steel and painted black.

if you want quality you need to find an exhaust that is 304 stainless steel.

magnaflow sells both 3" and 2.5" cat-backs
Corsa and Borla only sell 2.5"
MBRP only sells 3"

it has been proven you don't really NEED 3" unless you have a high horsepower vehicle making 500rwhp+

You have no idea what you are talking about.

Have you researched the Cherry Bomb exhaust?

It uses a single chamber muffler design. They do use aluminized steel which over a long period of time will show some rust. 409 stainless will show rust over time as well. In 10 years when I am ready to replace my exhaust I may see some rust. BFD.

Link for reference comparing the different alloys exhausts are made from:
http://www.pypesexhaust.com/stainless-steel.html

Now for plenty of facts and user experiences with the Cherry Bomb exhaust:
http://www.camaro5.com/forums/showthread.php?t=56584

Check your facts next time.

To the OP's question of 2.5" vs. 3", unless you plan to go forced induction the 3" exhaust will not be needed. Really comes down to what you are comfotable with. Both are great buys. Hope that helps.

Last edited by wbt; 04-29-2010 at 05:05 PM.
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Old 04-29-2010, 04:27 PM   #9
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Go with 3 inch
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Old 04-29-2010, 05:03 PM   #10
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Quote:
Originally Posted by RedJewel2SS View Post
problem with 3" and a stock motor is reduced back pressure creates less torque in the lower RPM range.
Can you prove this?
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Old 04-29-2010, 05:34 PM   #11
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I like the magnaflow systems they are a top notch. I installed long tube headers and 3" exhaust, It does seem to have a little bit less power on the freeway in 6th gear when cruising than it did with the 2.5 inch. It seems like they need a little back pressure for the low end torque but everyone on here has different opinions about it. Flowmaster doesnt flow very well and rust though, I dont if cherry bomb does.
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Old 04-29-2010, 06:06 PM   #12
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3in as well, look up jdp performance , big magnaflow dist. he is very helpful and cannot beat his pricing.also comes with tru xpipe..bought the 3in and it fit beautiful, sounds great and quality product..found this..Jordan Priestley | JDP Motorsports | President

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Old 04-30-2010, 10:43 AM   #13
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Quote:
Originally Posted by mikepage0007 View Post
3in as well, look up jdp performance , big magnaflow dist. he is very helpful and cannot beat his pricing.also comes with tru xpipe..bought the 3in and it fit beautiful, sounds great and quality product..found this..Jordan Priestley | JDP Motorsports | President

888-308-6007 Toll Free | 801-528-6706 Fax

jordan@jdpmotorsports.com | sales@jdpmotorsports.com

www.jdpmotorsports.com | www.magnaflowplus.com
+1 Great to deal with and the lowest prices around.
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Old 05-05-2010, 11:20 PM   #14
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Thanks for the input. I didn't realize that the Cherry Bomb was made of aluminized steel and will probably not go in that direction. I have listened to so many clips now and it is a hard decision again. I am kinda liking the Borla and Corsa also now. Hopefully I can make my mind up and have it before the car gets here. Thanks again
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Old 05-06-2010, 05:16 AM   #15
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Corsa makes great exhausts. I had a Corsa cat back on my GXP and loved it. Very high quality and good sound. I do not like the obnoxious very loud sound of some of the systems available. Just my preference. Plus Corsa has no drone.

That being said, I am installing a Solo Mach X cat back on my 2SS Saturday. They have good reviews, seem to be in the sound area that I like and easy to install. Will know how I like them after a few weeks.
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Old 05-06-2010, 05:46 AM   #16
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I run FlowMaster AT on both my cars ... They both sound great and the 409 will outlast the life of the car ...
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Old 05-06-2010, 06:38 AM   #17
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Have 2" L/T Headers, 3" high flow cat exhaust and CAI. I would have to see dyno proof that 3" causes torque loss because I can tell you the seat of the pants difference from stock is night and day at the bottom end. All articles I have read about the LS3 says it likes to breath.
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Old 05-06-2010, 09:55 AM   #18
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Doug Thorley Long Tubes and Catback system is the best bang for the buck out there without a doubt. You can get the entire system for under $1100 shipped if you look around.

Lifetime warranty, show quality ceramic coating ond both the inside and outside, all hardware included to install without cutting, welding or anything...Just a well designed and quality product.

Everything else is just opinion.

Best of luck in your decisions,
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Old 05-06-2010, 10:35 AM   #19
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Quote:
Originally Posted by axis View Post
Can you prove this?
No, he cannot.

Too large of exhaust piping can infact impact the flow velocity of the exhaust, which can affect the AFR on the motors next intake stroke, however this is more impacted on the header/manifold end as it sits right off the combustion chamber. An extra .5" catback system is not going to significantly impact "back pressure". The mandrel bends of a catback system affect back pressure more substantially than the size of the pipe.... granted your not using piping with the diameter of a coffee can. Like I said, .5" isn't going to play a significant role.

There are already vendors building 735+ HP supercharged, meth-injected setups on this forums and still using the stock exhaust (plus headers). The highest "dyno results" I have seen from gains in a catback are 15 HP... And this hasn't been independently verified. Catback is going to present more of a exhaust tone change and, in some cases, a weight savings.

Honestly the misinformation I have seen passed arond on this forum thus far is concerning.
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