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Im looking to get exhaust for my truck but i was wondering which is better 4in or 5in? I wanna do no muff no cat
The 4" will lower your EGT while towing...and should help pick up a little in the efficiency department. Which means you could gain some MPG, but don't expect it. You won't be able to get anything bigger than a 3.5" from the exhaust side of the turbo to below the firewall. At that point if you wanted to run a 5" to the rear of the truck you could...but you won't gain anything with a stock engine.
My preferred PSD vendor is Clay at RiffRaff...and he offers free shipping on exhaust systems.
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