[fahyim]

I have a 2007 mustang pony and just want to increase horsepower. By cheap i mean parts no more than $700.00

 

[gilmore]

1) Air filter and exhaust
2) ECU chip
3) Engine tuner
4) Nitrous Oxide
5) Throttle Body Spacer
6) A heavier foot

 

[hamdi]

You can't increase horsepower with just 700$.
I suggest you save up, and buy yourself a super-charger kit.

For now, you may wanna look at suspension, and changing the exhausts for a smoother ride.