Re: 3.5" to 4" Downpipe How much better??
Ya i lost low end torque bad with the stacks or maybe it was just they are so damn loud...Ill see if i gain anything back with the 4" duals over my current stacks.
2010 CCSB Afe Intake and dual exhaust
2006 CCLB F-250 Studs,Squeez,EGR delete,RR to AirDog II and a Airraid Intake & Sct Hot tunes *SOLD*
1963 Chevy Nova II 88mm turbo 408 LSX backhalved and tubbed 9.22 @ 145 @ 5000ft BUILT NOT BOUGHT!
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02 Cummins ECSB 5 spd,250s,edge comp 64 over a s475.. Work Truck