It's your car. Make it the way you want. Everyone has different goals and situations.
Catbacks can add measurable power. There is some great info at Mach 1 registry where three different catbacks were tested on an otherwise stock Mach 1. SLP and Magnaflo were two of them I believe. The gains were 8 - 12 hp as I recall.
Plenum and TB combos are a proven 10 - 12 hp. There has been tons of studies done on these...it's a no brainer. You have to decide if the $350 for both is worth it.
I also must agree that gears such as 4.10's are a great mod. They will make the car feel more like a 5.0 by adding power down low and make the car scream that much more at peak.
So, here is a list of common mods, price and hp gains:
1 - Catback...$300 - $500...10 hp
2 - Under Drive Pullies...$200 installed...8 hp
3 - Plenun/TB...$350...10 hp
4 - CAI...$80 - $250...0 - 8 hp
5 - 4.10's...$500 installed....0 hp (but seems like 40 hp)
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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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