Throw a set of VT stage II or Comp Cams XE270AH cams into the engine and you should pick up about 20 to 40 extra hp. If you have any money left over buy a Accufab throttlebody/plenum combo and have it installed. Accufab claims 11hp on a stock Mustang and more on a modded Mustang. I am running the Accufab 75mm kit and have no problems on my 97 GT PI swap
97 GT 5spd
FRPP PI heads,cams,intake,Tremec TKO tranny,Spec billet aluminum flywheel, Ram powergrip clutch kit, FRPP aluminum driveshaft,Pro 5.0 shifter, Steeda adj. clutch cable,quadrant, firewall adj. kit,BBK ceramic long tubes,BBK short x-pipe w/ cats,Magnaflow Magnapacks exhaust,Accufab 75mm throttlebody/plenum combo,Speed index CAI w/ K&N 9" filter,SCT X-cal tuner,Kenny Brown subframes, SHM strut tower brace, FRPP 13" Cobra brake kit, FRPP 98 Cobra 17x8" rims w/ 255/45 BGF KDWS,Bosch +2 plugs,MSD 8.5 super conductor wires
205hp/273tq w/ headers & exhaust before swap
9.6 @ 79mph in 1/8 mile before swap
253hp/296tq after PI swap & throttlebody kit
03 Cobra 17x9 & 17x10.5 rims waiting to be installed w/ 255/40 & 285/40 Nitto NT555 tires
97 GT 5spd
FRPP PI heads,cams,intake,Tremec TKO tranny,Spec billet aluminum flywheel, Ram powergrip clutch kit, FRPP aluminum driveshaft,Pro 5.0 shifter, Steeda adj. clutch cable,quadrant, firewall adj. kit,BBK ceramic long tubes,BBK short x-pipe w/ cats,Magnaflow Magnapacks exhaust,Accufab 75mm throttlebody/plenum combo,Speed index CAI w/ K&N 9" filter,SCT X-cal tuner,Kenny Brown subframes, SHM strut tower brace, FRPP 13" Cobra brake kit, FRPP 98 Cobra 17x8" rims w/ 255/45 BGF KDWS,Bosch +2 plugs,MSD 8.5 super conductor wires
205hp/273tq w/ headers & exhaust before swap
9.6 @ 79mph in 1/8 mile before swap
253hp/296tq after PI swap & throttlebody kit
03 Cobra 17x9 & 17x10.5 rims waiting to be installed w/ 255/40 & 285/40 Nitto NT555 tires