trifecta/ hptune?
 

dont know much about tuning but i am wondering if it is worthwhile to do a tune with just a gmpp catback and intake for 07 2.4 ss and what tune should i go

A tune will help your car's performance even if it was stock. However to get the ultimate potential from the tune you should do all your mods first so that includes header and downpipe to go along with what mods you already have. Also I would go with a Trifecta Tune. I did and my car's performance is soo much better now. You will not regret it!

I went with Hptuners... but I heard a amazing things from trifecta I eventually will go trifecta on top of my Hptuner. but u gotta have someone that knows hptuners to tune u cause the 2.4 are a pain from what my tuner said.