Discussion Starter · #1 ·
After installing AFE stage 2 on my 2000 f350 7.3 I now hear a hiss more than before. You can hear the turbo spooling up but the hiss sounds like the waste gate is open. When towing and the transmission changes I hear the whose but there is a hiss till I let up on the gas and then get back in it. The hiss is not as bad if you are heavy in the gas when the transmission changes. I am running the Hyper programmer in the 2nd mode. Any ideas?