do that rear diff really fit in it

 

oh another thing i beat my friends stang on a 75shot on the 100shot i beat a guy with a 2004 z06 with a knn the 100shot is not everday

 

put some tacos in it to give it some webos!!!!

 

rear end swap that's all you need!

 

Turbo!!!!

 

As mentioned earlier reflash the ECU and get a dyno-tune. This would be a good place to start.
Gained 17HP and 20TQ with the Cobb accessport. Either of these will fix your A/F ratio.

Installed UR pulley kit on a N/A setup and had no gains.

Or, just go twin turbos