2in arh
#3
Overkill=no, Unnecessary=yes With FI you want to get rid of exhaust gases without building backpressure. I doubt you'd see much hp difference 1.75" to 2" given your specs.
#4
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right know the car put down 730rwhp on epp mustang dyno with 1 3/4 headers.they could only take it to 5900rpm due to it running out of fuel,now the car has a full fuel system alkycontrol meth kit,and just trying to find the right headers before I take it back.