ok guys all i have engine wise is a k n drop in filter who and what would be my best bet to get the ecm tuned by and what gains would be expected thanks for your replys and i will finally post pics this friday of the cobalt but i hopefully wanna gt an ecm tune or ecu whatever it is called im new to ecotecs

 

Which SS do you have? HP Tuners has a package for the SC, and I can't remember the name of the company but there is a totally different one for the 2.4L.