Ive a bpm "twister" I bought of Jamie(breaking classics) and it sounds savage, it has a hard throaty sound not raspy or tinny sound, no problems with mine.
he loves the sound of the blitz on mine so noise is not an issue for him we had never heard of them and was wondering what lads who may have them taught of them,it is second hand but is complete from turbo out including sport cat for 550 au dollars so great value
Well put together and fitment is perfect on my classic, its loudish, I made a small choke for nct and no problems with it passing, I didn't try nct ing it without it just didn't want to cause agro with them. Bpm im mad about mine.
the one my bro is lookin at has a bung with it ,but also the got the original sti back box modified with a different flange to fit the bpm centre section and that's included in the price because the pit test for rego over there is very strict on noise so I think ill tell him to buy it seems to be good ,cheers for the help lads