2.5" vs 3" - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Unreal · 05-18-2016, 08:17 PM

Good video on differences. On high HP blower/turbo cars it makes even more of a difference. A solid full 3" exhaust should be on any 600+rwhp FI 5th gen.

*SSE 4 2SS* · 05-18-2016, 08:33 PM

Agreed, and I'm running 3.5 inch pipe and mufflers for the full length...

Nice find...

Bildo · 05-19-2016, 07:20 AM

Only issue I run into is the 3 inch pipes rubbing on my crossmember (after market elite engineering )

white1LE · 05-19-2016, 08:05 AM

So the 13 hp gain on a 600 hp engine would be approximately how much on a 1100 hp engine?

Trackman · 05-19-2016, 09:15 AM

The drone from my 3" Magnaflow drove me insane. I am back to stock and ok with giving up 20-30+hp for comfort........ until someone kicks my ass.

Unreal · 05-19-2016, 09:27 AM

Quote:

Originally Posted by white1LE

So the 13 hp gain on a 600 hp engine would be approximately how much on a 1100 hp engine?

Depends on setup. I've seen 60-100rwhp gains from a 2.5" to a 3" on a turbo setup. Plus the turbos spooled 400-500rpm sooner.

Drone also depends on whole system, headers, turbos, etc.

white1LE · 05-19-2016, 09:42 AM

Quote:

Originally Posted by Trackman

The drone from my 3" Magnaflow drove me insane. I am back to stock and ok with giving up 20-30+hp for comfort........ until someone kicks my ass.

What setup do you have on your car?

swiftkart · 05-19-2016, 11:26 AM

Test would have been better had they jetted it to the 2.5" to show what it would really do, I'm sure the 3" jetting was a lot closer to the open header tune as they didn't show it, no doubt the 3" is better in high hp apps, just would have been a better test with everything being equal on the tunes.

Unavowed · 05-19-2016, 12:33 PM

On a high horsepower motor, a 3" exhaust offers more performance than a 2.5" exhaust. In other breaking news, water is wet.

mrebusa · 05-19-2016, 02:03 PM

Quote:

Originally Posted by Unavowed

On a high horsepower motor, a 3" exhaust offers more performance than a 2.5" exhaust. In other breaking news, water is wet.

I literally laughed out loud

Trob85 · 05-19-2016, 02:25 PM

That's a good info piece there.

1KillerSS · 05-19-2016, 03:44 PM

Quote:

Originally Posted by Trackman

The drone from my 3" Magnaflow drove me insane. I am back to stock and ok with giving up 20-30+hp for comfort........ until someone kicks my ass.

My Magnaflow has zero drone. Infact this is the first time I've heard of a Magnaflow exhaust having any drone.

Trackman · 05-19-2016, 11:36 PM

Quote:

Originally Posted by 1KillerSS

My Magnaflow has zero drone. Infact this is the first time I've heard of a Magnaflow exhaust having any drone.

I guess every combination is different.
I have 3"magnaflow on my 67 and I love it.
Drone on my ZL1 I was so bad I was willing to give up Hp. Hopefully it's only 10 or 20 not 50.

1KillerSS · 05-20-2016, 07:53 AM

Quote:

Originally Posted by Trackman

I guess every combination is different.
I have 3"magnaflow on my 67 and I love it.
Drone on my ZL1 I was so bad I was willing to give up Hp. Hopefully it's only 10 or 20 not 50.

What combination do you have? I'm just running stock manifolds, with turbos. No cats.

05-18-2016, 08:33 PM	#2
SSE 4 2SS Boosted Moderator Drives: Bone Stock LS3 Join Date: Sep 2009 Location: Marion Tx Posts: 15,492	Agreed, and I'm running 3.5 inch pipe and mufflers for the full length... Nice find... __________________ If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough...

05-19-2016, 08:05 AM	#4
white1LE Drives: 2013 Camaro ZL1 Join Date: Nov 2012 Location: Dubuque, IA Posts: 880	So the 13 hp gain on a 600 hp engine would be approximately how much on a 1100 hp engine? __________________ 13 ZL1 A6 LSX 427 with AGP Twin Turbos, E85 and Flex Fuel. Built and tuned by ADM Performance 1000rwhp

05-19-2016, 02:25 PM	#11
Trob85 Svt lol Drives: 2011 ss inferno orange blown Join Date: Jan 2012 Location: Topeka Posts: 2,312	That's a good info piece there. __________________ plasti dip is not a mod.......and a cold air intake doesn't make you fast!

05-19-2016, 07:20 AM	#3
Bildo Drives: 2012 2SS/RS LS3 Join Date: Dec 2011 Location: Omaha, Nebraska Posts: 1,677	Only issue I run into is the 3 inch pipes rubbing on my crossmember (after market elite engineering )

05-19-2016, 09:15 AM	#5
Trackman Drives: 67RS Camaro ,Black 2013 ZL1 Join Date: Jun 2010 Location: Alberta Posts: 1,408	The drone from my 3" Magnaflow drove me insane. I am back to stock and ok with giving up 20-30+hp for comfort........ until someone kicks my ass.

05-19-2016, 11:26 AM	#8
swiftkart Drives: 2010 SS/RS LS3 M6 Join Date: Apr 2011 Location: Kansas Posts: 693	Test would have been better had they jetted it to the 2.5" to show what it would really do, I'm sure the 3" jetting was a lot closer to the open header tune as they didn't show it, no doubt the 3" is better in high hp apps, just would have been a better test with everything being equal on the tunes.

05-19-2016, 12:33 PM	#9
Unavowed Drives: Twin turbo G8 GXP Join Date: Dec 2012 Location: MD Posts: 454	On a high horsepower motor, a 3" exhaust offers more performance than a 2.5" exhaust. In other breaking news, water is wet.