I think he means like a dumpvalve kind of noise, my car makes the same noise and I've noticed a decrease in torque when I floor it, so I'm guessing I have the same problem, for the time being I think I will try the O-ring solution to put me on until I can afford the Forge kit.
Hi there, I mean that when I let off the accelerator and change gear there's sometimes a light whooop noise. Not like a dump valve pttissssh noise. (Hope that makes sense?)
Think I'll try the new o-ring thing first.
Replaced mine today with a thicker o-rings, much harder to put the pipe back in and the noise has stopped so hopefully will last a long time.
Hi Simon, any idea what size o-ring you used? Thanks.