2.5in or 3.0in? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

acuraelin · 09-20-2010, 03:30 PM

I have a stock LS3 right now and trying to get the exhaust but I'm no sure whether i should get the 2.5 or the 3in. I do see myself with SC in the future so perhaps I should get the 3in but in the mean time the 3in will decrease performance? IF I get the 2.5 and i got SC will that 2.5 be sufficient?

Please help, thanks

2010 2-Tone · 09-20-2010, 03:33 PM

Go with the 3" now and save from having to get it later. I do NOT think you lose any HP.

caverman · 09-20-2010, 03:36 PM

I vote for 3"....if nothing else but for the sound. The 3" is going to be a much deeper tone.

I don't think you're going to loose any power at all. Unless you buy a complete system then the cat-back is probably going to have a 2.5" inlet to hook up to your factory mid-pipes anyway.

You just need to do so research because from what I've seen, most of the cat-backs that sound good with the factory headers/mid-pipes will be too loud once you go with headers. Of course everyone has their own preference so you may like the extra loud.

GMRULZ · 09-20-2010, 03:52 PM

If your going supercharger 3.0 no question, don`t even think 2.5.

quick89 · 09-20-2010, 04:14 PM

3in

Anthony @ LG Motorsports · 09-20-2010, 05:04 PM

I would go full 3" all the way. I have seen ZERO loss on the car by doing the bigger pipes, even on stock engine cars.

caverman · 09-20-2010, 05:13 PM

Quote:

Originally Posted by Anthony @ LG Motorsports

I would go full 3" all the way. I have seen ZERO loss on the car by doing the bigger pipes, even on stock engine cars.

And LG's full setup would be a very good choice.

Apex Motorsports · 09-20-2010, 05:21 PM

Quote:

Originally Posted by acuraelin

I have a stock LS3 right now and trying to get the exhaust but I'm no sure whether i should get the 2.5 or the 3in. I do see myself with SC in the future so perhaps I should get the 3in but in the mean time the 3in will decrease performance? IF I get the 2.5 and i got SC will that 2.5 be sufficient?

Please help, thanks

3 inch without a doubt if forced induction is even a possibility. You will not suffer any negative effects in the mean time. Don't get anything crazy loud, but the time you add a supercharger and headers it will be unlivable.

SSOOCH · 09-20-2010, 05:24 PM

I went with 3" and I don't even have headers yet! I love the Magnaflow #16483 system.

Go 3" all the way!!

mikepage0007 · 09-20-2010, 05:26 PM

Quote:

Originally Posted by SSOOCH

I went with 3" and I don't even have headers yet! I love the Magnaflow #16483 system.

Go 3" all the way!!

+1, jdp motorsports- jordan

NateSS · 09-21-2010, 10:02 AM

Go with 3". Cant go wrong. I went with the 3" MBRP catback and its pretty darn good. Unlike the Corsa, its got a low deep sound to it. I also seriously doubt i have lost any performance with it either.

*Mindz* · 09-21-2010, 03:06 PM

It's funny that everyone says this, but both Lingenfelter and Hennessey use a 2.5" exhaust on all their cars...I'm still waiting for proof that 2.5" gives you the same benefit as 3".

caverman · 09-21-2010, 03:18 PM

Quote:

Originally Posted by Mindz

It's funny that everyone says this, but both Lingenfelter and Hennessey use a 2.5" exhaust on all their cars...I'm still waiting for proof that 2.5" gives you the same benefit as 3".

Unless you're going with big HP numbers I don't think it will matter if you go 2.5" or 3". However, the 3" usually has a much deeper tone to it.

I would think that if you like say Borla then go with their cat-back even though it's 2.5". However, if you go with say Magnaflow where you have the choice of 2.5" vs 3".... I would go with 3" for the tone if nothing else.

Alot of Mfgs don't give you the choice....it's either 2.5" or 3". I think Magnaflow and maybe SLP are the only ones where you might have a choice.

I think most people are saying 3" for sound more than performance.

acuraelin · 09-21-2010, 04:41 PM

Quote:

Originally Posted by SSOOCH

I went with 3" and I don't even have headers yet! I love the Magnaflow #16483 system.

Go 3" all the way!!

Thanks suprabad, i saw your video and it soudns nice, that's the system i want!!

Thanks everyone for the inisght, 3in it is!! I knew I can count on y'alls opinion

09-20-2010, 03:36 PM	#3
caverman Drives: '69 SS Convertible Join Date: May 2009 Location: DFW, TX Posts: 7,111	I vote for 3"....if nothing else but for the sound. The 3" is going to be a much deeper tone. I don't think you're going to loose any power at all. Unless you buy a complete system then the cat-back is probably going to have a 2.5" inlet to hook up to your factory mid-pipes anyway. You just need to do so research because from what I've seen, most of the cat-backs that sound good with the factory headers/mid-pipes will be too loud once you go with headers. Of course everyone has their own preference so you may like the extra loud. __________________ *-2010 Camaro* 2SS \| M6 \| VR w/White Stripes \| 1 3/4" KOOKS - 3" Magnaflow \| LPE 3.91 gears \| ADM tuned \| Halltech w/ADM Scoop \| Spohn/BMR Trailing Arm/Toe Rod \| BC Coilovers\| Pedders FE4 ZL1 swaybars \| Cradle/Diff/Radius Rod bushings \| VMax TB \| Morimoto Projectors \| MGW shifter \| Red Calipers Build Journal

09-20-2010, 03:52 PM	#4
GMRULZ Drives: 2010 SS & 2008 C6 Join Date: Mar 2008 Location: VA Posts: 1,819	If your going supercharger 3.0 no question, don`t even think 2.5. __________________ 2010 SS L99, 536rwhp 10.843@126.72. Whipple Supercharger stock pulley, ARH 1 7/8 longtubes w/ catted xpipe, magnaflow 3" mufflers, ADM Race CAI, 3:70 gears, lightweight wheels and nitto drag radials. Stock internal L99, stock converter. Bolt on best before blower 12.22@113.29 w/ nothing but ARH headers, catted x-pipe, ADM CAI and a tune on stock Pzero`s! Other car 2008 C6 Ls3, z51, A6, Npp Exhaust, best bonestock pass 11.80@118.82, Number 2 on the Corvette Forums Bonestock fastest list..

09-20-2010, 05:24 PM	#9
SSOOCH Camaro SL,UTs Drives: 2010 Camaro SS/RS #16429 Join Date: Sep 2006 Location: South Jordan, UT Posts: 7,358 View My Garage	I went with 3" and I don't even have headers yet! I love the Magnaflow #16483 system. Go 3" all the way!! __________________

09-21-2010, 10:02 AM	#11
NateSS 1337 AH64D driver Drives: 2010 Camaro 2SS/RS L99 Join Date: Sep 2010 Location: Houston, TX Posts: 254	Go with 3". Cant go wrong. I went with the 3" MBRP catback and its pretty darn good. Unlike the Corsa, its got a low deep sound to it. I also seriously doubt i have lost any performance with it either. __________________ Cam/Heads by ARD, Tune by G-Force, Transmission/Gears by Circle D

09-21-2010, 03:06 PM	#12
Mindz E.B.A.H. Drives: you wild... Join Date: Mar 2007 Location: In the happy padded room wearing a jacket that makes me hug myself... Posts: 18,421	It's funny that everyone says this, but both Lingenfelter and Hennessey use a 2.5" exhaust on all their cars...I'm still waiting for proof that 2.5" gives you the same benefit as 3". __________________ Blue Rush, 2010 SS [Car of the Week 3/22/2010] Traded in on...ZLZBUBB, 2013 ZL1

09-20-2010, 03:30 PM	#1
acuraelin Drives: 2011 1SS Join Date: Jul 2010 Location: my garage Posts: 97	2.5in or 3.0in? I have a stock LS3 right now and trying to get the exhaust but I'm no sure whether i should get the 2.5 or the 3in. I do see myself with SC in the future so perhaps I should get the 3in but in the mean time the 3in will decrease performance? IF I get the 2.5 and i got SC will that 2.5 be sufficient? Please help, thanks

09-20-2010, 03:33 PM	#2
2010 2-Tone Drives: 2010 RY 2SS with Custom Stripes Join Date: Mar 2009 Location: Jennings, La. Posts: 2,220 View My Garage	Go with the 3" now and save from having to get it later. I do NOT think you lose any HP.

09-20-2010, 04:14 PM	#5
quick89 Drives: 5.3 ls based 89 gmc 1500 sierra Join Date: Aug 2010 Location: DFW Posts: 27	3in

09-20-2010, 05:04 PM	#6
Anthony @ LG Motorsports Drives: 1994 1LE / 2006 Z51 Corvette Join Date: Jul 2009 Location: Plano, TX Posts: 2,829	I would go full 3" all the way. I have seen ZERO loss on the car by doing the bigger pipes, even on stock engine cars.