I'll explain the problem to you. I had a Chinese 7.5 intercooler, the Jpipe 3" masata kit and the vrsf pipe charge for 335d tank. the problem came from the 90° masata silicone hose which comes out of the intercooler towards the Jpipe... it was too long (I should have cut it a little) when you connect the Jpipe to the charge pipe...the Jpipe goes back a little and pinches the hose. I really think that's where my problem comes from. I ordered another 7.5 intercooler, this time I got it from BMS (it has the plate inside which allows the air flow to be better diffused). I also ordered the transmission oil radiator from BMS because the small original intercooler bothers the Jpipe a little. I also changed my coolant radiator..I took the one designed for the manual gearbox..this avoids having hoses hanging with plugs. I really hope that my problem came from the...I still have a little apprehension. I checked the adjustment of my wastegates...I adjusted it simultaneously (vacuum gun connected to a plastic T to activate the two turbos in time and be sure to have an identical adjustment) I hope my message is understandable