ADVICE NEEDED: Should I invest in a intake and exhaust? If yes what are the pros and cons of them? For exhaust I'm looking for stillen. Any feedback is appreciated

 

If your want your exhaust to sound better then yes. But don't get it to expect a huge power gain.

 

Yeah I'm only just looking for better sound

 

What do you recommend?

 

My suggestion would be in the following order:
AAM
Borla
Stillen
Megan
Cutom made flowmaster
Custom made Magnaflow

You should also look at the Racingline ypipe. I don't know about replacing the resonator on some of these setups. You would have to browse youtube for soundclips, ans search the forum for more info