What's up man what size intake piping is that? And what type of filter are you using.

From personal experience when I had my 38-81 I was on the dyno and the car wouldn't make any more power and I couldn't figure out why. I took the air filter of and it made 4 more psi. Went from 18psi to 22psi and hit boost cut at that point. People are finding that you also don't have to rev these blowers to the moon in order to make the power.

Also id pull the pipe all the way off if you already haven't. It could be the car is starving of air and perhaps that could be some issue of noise?

I'm not sure what more to suggest other then what I mentioned above or to pull the blower off and have it checked. I'm hoping nothings wrong because I'd hate for you to lose faith in these blowers.

Also did you reverse mount the w.g. Like jaydee did? Could be creeping boost out there as well.

s4 IG-petefromthestreets