Model : Japspeed system (2.25">2.5">3") Noise : I believe it's <90ish dB off boost, pretty quite but a nice burble <98dB on boost but it sounds quite hefty (with a 2.25" decat) Quality : Fitment: 8/10 Materials: 8/10 Cost : New: £349 rrp Used: £200ish Videos: />http://youtu.be/5o0D7q-WsvI />http://youtu.be/MniojL_p0R0 />http://youtu.be/hWg81bxMsEA