[kbutler971]

X2 on the Classic Chambered upgrade over my restrictive OEM CCX pipes which were in pretty bad shape after 20+ years. Followed the instructions on the CC website and used my OEM collectors, mounting brackets, etc. and everything fabbed up fine. I went with the 20" x 3" packed, new turnouts and internal expanders on my 428/370 RWHP motor. No pre-post dyno testing but sensible improvement in throttle response and breathing was significant and real. Noise also increased, not terrible at low rpm/load but alot sharper at WFO. Earplugs all the time now. To do over I'd maybe go with 22" or 24" packed mufflers for noise attenuation. Great people to do business with too.