Your gonna need more than exhaust for low 12s with and auto. Ive had flowmasters on every stang ive had. 8 before this one. I went magnaflows this time. After the Xpipe went on its loud when you get into it. But no drone when cruising and a nice idle. And different from all the flowmaster stangs out there.
Go with the 4.10s, Im upping my 3.90s to 4.10s, I just bought a new Rear from a buddie, 31 spline axles and HD traction loc and HD TA cover. Ive got my rear sold and some ET Drag slicks on the way. Low 12s arent easy without traction.
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1997GT SOHC, PI Heads,intake, SCT 4 bank, UPR CAI
Zex Nitrous system 125 hp shot,Steeda Tri-AX
March Underdrive pullies,2 1/2 O/R Pipe, Magnaflow Catbacks,Mac Upper and lower Control arms,5 speed
4.10 Gears,31 spline, Nitto 555 drag radials Spinning
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