I just installed a process west intake muffler delete and it's coming off as soon as car has cooled down. The awesome turkey noise from the Herrod intake that I used to get when closing the throttle is gone, and replaced with a whoosh that sounds like the boost leak I had when the joiner into the throttle body split. The increased spool sound is pretty average, a kinda dirty noise and not the clean turbine sound I was expecting. I'll check the rubber joiner when I take it off to make sure it hasn't split, they're pretty bloody flimsy but I don't think that's the problem. Disappointing, it was pricey for a metal pipe, a hose and two jubilee clips, even more so considering I won't be using it.