On budjetexhaust.com website it has one that california spec and a regular one. WHat is the difference between them. Which one gives me more power?

 

california emissions is stricter then else where. the regualar one gives more hp. if any

 

To clarify:

Which one you need depends on your car. If you car is cali spec, then you must use that pipe. If yours is fed spec, you must use that pipe.

 

and the easiest way to tell this, is to look in your engine bay, in front of the valve cover, down toward the radiator...in between the radioator and the engine, should be o2 sensors...if there is 4, thats cali-spec, if there are 2, fed spec.