quality parts, someone told me to just get a cheap bombz intake off ebay, thats not quality though. do u suggest that i get a better one like AEM?

 

Ah you're mixing the two...

GReddy/Apexi are the manufacturers of the SP2/WS2 cat-backs, respectively.

The intake can be the cheap bombz intake, coupled with a K&N or AEM filter.

Now I have an 03 (7th gen) so this isn't compatible for you (idt), but for comparisson, i got this one in red.

 

so the intake dosent matter so much its self but gotta have a quality filter. question on the exhaust what is the purpose of the resonator?

 

The resonator, along with the muffler and mid-pipe size, tune the resonant frequencies of the exhaust to the engine. This helps to produce a pleasing sound rather than a cheap fart-can buzz or a the bubble heard on rev-down from a mellon-launcher.

In racing applications, the resonant frequency can help make a bit more power by creating pressure fluctuations that are time-matched with exhaust valve operation.