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Old 09-20-2010, 03:30 PM   #1
acuraelin
 
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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
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Old 09-20-2010, 03:33 PM   #2
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Go with the 3" now and save from having to get it later. I do NOT think you lose any HP.
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Old 09-20-2010, 03:36 PM   #3
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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.
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Old 09-20-2010, 03:52 PM   #4
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If your going supercharger 3.0 no question, don`t even think 2.5.
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Old 09-20-2010, 04:14 PM   #5
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3in
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Old 09-20-2010, 05:04 PM   #6
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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.
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Old 09-20-2010, 05:13 PM   #7
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Originally Posted by Anthony @ LG Motorsports View Post
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.
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Old 09-20-2010, 05:21 PM   #8
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Quote:
Originally Posted by acuraelin View Post
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.
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Old 09-20-2010, 05:24 PM   #9
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I went with 3" and I don't even have headers yet! I love the Magnaflow #16483 system.

Go 3" all the way!!
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Old 09-20-2010, 05:26 PM   #10
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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
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Old 09-21-2010, 10:02 AM   #11
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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.
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Old 09-21-2010, 03:06 PM   #12
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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".
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Old 09-21-2010, 03:18 PM   #13
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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.
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Old 09-21-2010, 04:41 PM   #14
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Quote:
Originally Posted by SSOOCH View Post
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
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