What we are tried,loudest has been Buddy Club Spec IV(this has been on Subaru Impreza with 555.5bhp),we are been on Snetterton and didn't pass noise test,at 5000RPM we are hit 109.46 dB and this has been with external wastegate closed...With screamer and external wastegate open I would expect above 120dB
On EP3 we are tried few exhausts and backboxes,but loudest has been titanium tip no name exhaust and this has been properly loud,not sure how much dB,but I wouldn't be surprised if this exhaust will hit 120dB,on idle has been very loud
Thanks,Jura