I lack the power that I had before. I noly have a DP and a 3" catback exhaust and a Koyo, but that is besides the point. I can only read .5 bar on the boost gauge and I can clearly hear as if my BOV was letting air out right at .5 bar and it continues to do so. I always warm the car up and turbo time the turbos. What d you think it is? Thanks

 

You most likely have a boost leak somewhere. Are you still using the stock couplers (Y-pipe to crossover pipe, crossover to IC, etc.)? If so, that is most likely your problem. Check the Y-pipe coupler first.

 

BTW, you have to take the Y-pipe coupler off the car to inspect it - you'll never be able to see the tear with it still on the car. Pretty much every 3rd gen I've worked on has had that coupler torn.

Take it to a local rubber and gasket supply shop - hit the yellow pages, most every town has them. Ask them for a silicone replacement - some call it "turbo sleeve". Should only run you a few bucks and you're back in business.

Dale