2 1/2" or 3" exhaust? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

lechess · 02-02-2016, 11:23 AM

So im ready to change the exhaust on my ls3. Right now im stock, i will be getting LT headers, but my question is i like the sound of the corsa sport but its 2/12" tubing. I was thinking 3" would be the better option but not sure if it would make any difference. What are you guys experience with exhaust or opinions? If i go with corsa sport i will get texas speed 1 7/8" headers. Or if i go the 3" route i will get the xs power system that have LT's.

lechess · 02-02-2016, 11:26 AM

Btw only mods will be cai, full exhaust, and tune. Future plans would be a cam swap, but not anytime soon.

stock block · 02-02-2016, 11:26 AM

Duel 2 1/2" will support 600hp-700hp ,so unless you plan on going over those power levels you really don't need 3" .unless your wanting a different sound

Apex Motorsports · 02-02-2016, 11:37 AM

Quote:

Originally Posted by stock block

Duel 2 1/2" will support 600hp-700hp ,so unless you plan on going over those power levels you really don't need 3" .unless your wanting a different sound

This. You have to push a whole hell of a lot of air before 2.5" starts to be detrimental. Sound would be the only difference.

Pro Stock John · 02-02-2016, 01:22 PM

I went to 3.0 exhaust (Hooker Blackheart), and I trap 125.5 right now.

stock block · 02-02-2016, 01:35 PM

Quote:

Originally Posted by Pro Stock John

I went to 3.0 exhaust (Hooker Blackheart), and I trap 125.5 right now.

How many mph did you pick up with full 3" over your previous exhaust setup ?

BFASTNOTLAST · 02-02-2016, 06:54 PM

For another comparison I have a full 2 1/2" system and with the cut outs open on the dyno there is no difference in power. Take it for what it's worth but like the others said unless you're making big power 3" will only change the sound at the level you're at now.

Homeless Man · 02-02-2016, 07:15 PM

Get the ZL1 Corsa. It looks/sounds better and is 3inch

tmaleck · 02-02-2016, 09:19 PM

I have Stainless Works 3" on my L99. Sounds great, no drone and deep tone under load.
Tim

Tenring · 02-02-2016, 09:27 PM

I have stainless power headers and a Corsa, love it.

lechess · 02-02-2016, 11:16 PM

Thanks yea i searched the web and thought that 2 1/2" would not cut it for cammed 6.2L.. I would like the zl1 corsa kit but i do not want to change out the rear diffuser at the moment.

Homeless Man · 02-03-2016, 04:43 AM

If u still want to rear diffuser costed less than $100 and took like 10 minutes to swap

Pro Stock John · 02-03-2016, 09:41 AM

Quote:

Originally Posted by stock block

How many mph did you pick up with full 3" over your previous exhaust setup ?

Have not dynoed since the swap.

My own gut feeling is that 3.0 is worth doing when making 475-525rwhp like some of us NA guys, but Billy's comment above negates that.

BFASTNOTLAST · 02-03-2016, 10:28 AM

Quote:

Originally Posted by Pro Stock John

Have not dynoed since the swap.

My own gut feeling is that 3.0 is worth doing when making 475-525rwhp like some of us NA guys, but Billy's comment above negates that.

Just stating what I found out with my set-up. Everyone is different.

02-02-2016, 11:23 AM	#1
lechess Drives: LS3 Join Date: Jun 2015 Location: san antonio Posts: 75	2 1/2" or 3" exhaust? So im ready to change the exhaust on my ls3. Right now im stock, i will be getting LT headers, but my question is i like the sound of the corsa sport but its 2/12" tubing. I was thinking 3" would be the better option but not sure if it would make any difference. What are you guys experience with exhaust or opinions? If i go with corsa sport i will get texas speed 1 7/8" headers. Or if i go the 3" route i will get the xs power system that have LT's.

02-02-2016, 01:22 PM	#5
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	I went to 3.0 exhaust (Hooker Blackheart), and I trap 125.5 right now. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

02-02-2016, 06:54 PM	#7
BFASTNOTLAST Drives: 2012 SS LS3 Join Date: Mar 2012 Location: Denver NC Posts: 1,411 View My Garage	For another comparison I have a full 2 1/2" system and with the cut outs open on the dyno there is no difference in power. Take it for what it's worth but like the others said unless you're making big power 3" will only change the sound at the level you're at now. __________________

02-02-2016, 07:15 PM	#8
Homeless Man Homeless Life Chose Me Drives: LS3 (sold 4/21) Join Date: Nov 2014 Location: Streets of Philly Posts: 3,650	Get the ZL1 Corsa. It looks/sounds better and is 3inch __________________ Pity a man in familiar places, who yet feels like a stranger.

02-03-2016, 04:43 AM	#12
Homeless Man Homeless Life Chose Me Drives: LS3 (sold 4/21) Join Date: Nov 2014 Location: Streets of Philly Posts: 3,650	If u still want to rear diffuser costed less than $100 and took like 10 minutes to swap __________________ Pity a man in familiar places, who yet feels like a stranger.

02-02-2016, 11:26 AM	#2
lechess Drives: LS3 Join Date: Jun 2015 Location: san antonio Posts: 75	Btw only mods will be cai, full exhaust, and tune. Future plans would be a cam swap, but not anytime soon.

02-02-2016, 11:26 AM	#3
stock block Drives: 2015 zl1 Join Date: Oct 2015 Location: Calgary Posts: 200	Duel 2 1/2" will support 600hp-700hp ,so unless you plan on going over those power levels you really don't need 3" .unless your wanting a different sound

02-02-2016, 09:19 PM	#9
tmaleck Drives: Replacement 2SS 'Vert 67 Cutlass Join Date: Aug 2015 Location: austin, tx Posts: 124	I have Stainless Works 3" on my L99. Sounds great, no drone and deep tone under load. Tim

02-02-2016, 09:27 PM	#10
Tenring Drives: 2014 2SS/RS - SIM Join Date: Apr 2014 Location: Arizona Posts: 2,188	I have stainless power headers and a Corsa, love it.

02-02-2016, 11:16 PM	#11
lechess Drives: LS3 Join Date: Jun 2015 Location: san antonio Posts: 75	Thanks yea i searched the web and thought that 2 1/2" would not cut it for cammed 6.2L.. I would like the zl1 corsa kit but i do not want to change out the rear diffuser at the moment.