I've had my FI carbon fiber cbe with 18" res and HFC on for about 3 months and it's still pretty loud but toned down quite a bit once broken in. I was told CF adds to the volume level hence why I went 18" on the resonators. Living in an apartment I don't want complaints. Stainless steel is lower level but a smoother growl. Hope that helps. If u go stainless and want volume get 12" and for even louder get test pipes. But my combo is plenty enough for me already have trouble hearing on phones lol..
__________________
GTM Stg. 2 TT||F.I. CF 18" Res. CBE||GTM 3" Downpipe ||Injen Cold Water Intakes||UpRev||Work Gnosis GS2||Hankook||Tein Monoflex||Hawk||Seibon||Aero Jacket|| 
|