i just bought a shelby gt 6 mos ago and would like to add a little more hp to it with limited funds. One suggestion was add a 1 pc. aluminum drive shaft and someone said i would gain about 15 hp. another was to chip it for 20 or so hp. the above would cost about 1200.00 installed any suggestions out there? Oh ya later when i can afford it i want to install a kenne bell supercharger.  

You can go wrong with a clod air kit, a tuner, and a set of pullies.  I don't think you'll pick up and power with a driveshaft change but I know the stock one weights a ton.  And you know what they say: A reduction of 100 lbs. is worth a 1/10 sec at the strip.  

Sorry for the typo.  Should have been ANY power, not and power...opps.  

I would change the cold air intake probably one form steeda, and steeda pulleys, and a sct tuner from steeda so get online at steeda.com and they have a free catalog so check em out.