Cheap Tricks
 

I just bought my first 91 Mustang GT almost a year ago. I have been trying to learn about it ever since. Right now the old owner put a shift kit in it along with and undertoe pulley(not sure if thats exactly what it is called, but it is and extra gear the belt goes around. I have since put a K&N cold air intake on. I plan on buying 40 Series Flowmasters soon w/ H pipe. i was wondering if there are any other little things in a cheap expense range that I could od to get more power.(I am only 17, so I don't get paid the best money)

best bang for the buck is gears, 3.73's cost bout $200, if you get them installed, about another $200. $400 to get pushed back in your seat...SOLD!

You need more air into the engine
 

Go to the wrecking yard and look for the largest Ford mass air meter from a car or a truck. Take it home and unbolt the black electronic sensor from the metal body. Unbolt the same piece from the mass air meter on your car and put on the new one. I took mine from a 94 to 95 Thunderdird and it works great. You shouldn't pay more than $20 for it, because I got mine for free. :D