The bolt ons that i could actually feel were the long tubes and mid pipe, gears, and tune. The rest probably helped a little, but i couldn't actually feel a difference.
Oh yeah...i felt the nitrous just a little too! 
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2004 DSG Mustang Gt, BBK long tubes, BBK catted h pipe, SSS Terminator Catback, K&N cai, Steeda UDP's, Accufab 75mm tb/plenum, FRPP aluminum ds, Motive 3.90 gear, Alternative Auto custom tune, Steeda Tri-Ax, DD black bullitts w/315's Nitto 555R's, & 100 shot N20. 269/305 na, 373/528 N20
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