hks

http://www.performanceexhausts.net/dvs.html

do i need the recirculating fitting kit?

 

I'm guessing you're talking about the HKS kit, in which case no. Well, no whichever kit. Unless you (or other frequent occupants of the car whose opinion you actually care about ) don't like whooshy noises. There's no problem running the car without the re-circ thing.