Well, since you said "small add-ons" I would say this is a pretty complete list:
1 - Gears (4.10s) - about $500 installed. No HP gain, but increases performance greatly. Like adding 30-40 hp.
2 - Under Drive Pullies - About $200 installed. 8 - 10 hp
3 - Cold Air Kit w/ K&N - $60 - $250 depending. 0 - 15 hp depending on which one and what you believe. The higher priced ones don't add more hp, just look better
4 - Plenum and larger throttle body - $400 or so. Easy enough to install. 9 hp...proven
5 - X Pipe. $200 - $400. 5 - 15 hp depending on the model. You need to research this depending on your other plans for exhaust.
6 - Chip or Programmer. $200 - $400. 5 - 15 hp depending on your car mostly. Autos see better performance improvement because these devices will help the way the car shifts gears.
7 - Nitrous. $400 - $1000. Safely up to about 100 hp. Biggest bang for the buck.
All hp values are actually rear wheel hp, so hp at the flywheel is about 15% higher.
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My Stang:
2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)
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