Hey there,
I have a problem with my mk1 RS, it seems that it has somewhere a leak in the pressure side of the intake system, but i can´t find one. when under boost, starting at about 0.4-0.5bar you here a loud blowing noise. And right at about 5500rpm+ it sometimes behaves like it has misfires. I mean short time of no power.
I searched the hoses for leaks by demounting them and set them under pressure. I did the same for the chargecooler. I also checked the blow off valve, which also seems to be ok. So there is just the inlet manifold left to check, but I don´t think that it has a leak, and because it´s quite an efford to demount it, I ask here if you guys maybe had once the same problem with your RS.

Please excuse my bad english, but I´m from Austria. Post all your suspicions, maybe one can help me because I´m really desperated

 

there is a outlet on the back of the inlet (where the take off for the dump valve comes off ) that should have a cap over it. thats common for coming off.

also the hose with the one way vavle in it (leading to the induction hose ) is bad for going

Craig