Sky R33 GTS-T - zia

Hey mate, thnx for letting me know, and plus i had to ask this, while testing my car at 160kph, i found a whistling sound, im not sure wat is it related to , didn sound very convincing though, btw any specific pod filter brand suggessions?? thnx heaps

Hi Guys, I bought a R33 GTS-T 1996 yesterday,so basically hav no idea abt it, ive got wat i believe is the HKS exhaust system(green element), wen put the foot down, theres a whoosh sound like an airplane taking off, is dat a problem?? thnxx