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.
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.
1 7/8 Will show a minor gain but overall it will run alot harder due to less back pressure. I say ur doing good with the 1 3/4, But frost I think on this board runs 1 7/8 and is around 800+
__________________ 760 HP 689 TQ !!! THANKS LETHAL PERFORMANCE!!!
14psi
1 7/8 Will show a minor gain but overall it will run alot harder due to less back pressure. I say ur doing good with the 1 3/4, But frost I think on this board runs 1 7/8 and is around 800+
we ran out of fuel on his car so couldnt take the car any further, this is also an auto car
__________________ [/SIGPIC]370ci,th400-nasty stage3 fuel system-Kentucky st-80 turbo kit-and im packing a 9"
Ran 17/8 on the 408 and made all I wanted lol! And now I am running 2" Kooks on the 346 with the F1R. Is is needed no. Does it make a difference you have to be the judge. If you are buying headers anyway. Well I probably would buy the 2" as it won't hurt you.
we ran out of fuel on his car so couldnt take the car any further, this is also an auto car
Its still a strong running car Im sure with the fuel is work out it will be even better. Like jeff said 2 inch wont hurt nor will the 1 7/8. Im not sure on the gains but it will be over 800+
__________________ 760 HP 689 TQ !!! THANKS LETHAL PERFORMANCE!!!
14psi
2in arh 
RX7 FD, Sheetmetal Widebody, CandyPearl Orange Paint, Fiberglass hood, doors, trunk, wing, bumper, ported Warhawk headed forged LS7 427, Spec Twin Carbon, Tranzilla T56, Procharger F2, meth inj, Cobra 8.8 rear conversion w/TrueTrac, Makaveli 3pc Forged wheels 19f/20r, Nitto INVO 345/25/20r 305/30/19f 
