I'm having difficulty determining which class I'm in, some people are saying CSP, others are saying STX...

Mods are:
Header, Testpipe, Axleback, Intake, Rims/Tires, Full Suspension (Coilovers + Shocks) and different pedals.

Anybody know?

Thx.

 

I think STX requires full emmissions gear, so you woulod be in CSP. STX does allow high-flow convertors, so you might want to get one, as CSP cars tend to be pretty quick and prepared well beyond what you have.

 

You have to run a CAT in STX, but you can use a high flow unit as long as it's within 6" of the stock location

 

Yup they're right you would be in CSP. If you put the cat back in you're STX legal.