Bigger is ALWAYS better

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Jun 10, 2006 | 12:31 AM

FormulaFire

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Bigger is ALWAYS better

Alright.. here's the dealio. What size exhaust should I be running for maximum efficiency? 391 LS2 with a T88.. 4" downpipe.. Should I keep running 4" exhaust all the way or step down to 3.5" or even 3".. Ofcourse I will have a cutout after the downpipe.. if that makes a difference

Jun 10, 2006 | 01:04 AM

1bdbrd

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dont know if it helps any but im planning to run a 4 inch exhaust from the back side of my t67 turbo. to a 4 inch cutout and then on to a 4 inch borla xr1 or similar muffler.

Jun 10, 2006 | 01:06 AM

Assassin

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From: Nevada

4" all the way back..... your tune will be off if you open the cutout, so I would steer away from that ideaw w/the turbo... as long as you stay same diamater things will be great, also make sure you exit it just past the back bumper so you dont get any drowning road noise on the highway...