I have the derestricted airbox, veccy c pipe and pipercross panel filter on at the moment on my Turbo'd Coupe ... but Demon Tweeks have knocked a stack of Pipercross Viper kits ... would I gain much .. torque? bhp? over my current setup?
Also what do they sound like? I had a K&N 57i on my old Golf GTI and it sounded meaty, but it was open cone... are the carbon enclosed ones as nice sounding? or not?