injector ?
 

Do i need a diff harness for 42# injectors of the gm stage 2 kit and if i do where can i get one and does anyone sell them

The answer is two fold.

You would need to cut off your injector connectors and add the 42's. On top of that you'll need the LSJ 1 bar map sensor connector.

I purchased the injector wiring harness from the 2005 Chevy Cavalier. It is a plug and play into our harness, it has the proper connectors for the GM Stage 2's and it has the LSJ 1 bar map sensor connector.

dude if you're looking at going pc'ed just use 60's .. you'll be out of the range or close to out of the range of 42 immediately and the 60's are plug and play