once i got rid of that restrictive aps reducer pipe and bolted up a full 3" single-side exhaust, i have'nt had any problems holding boost. hopefully after i get it tuned next month, i can hit somewhere near 400whp.

 

How about 421whp @ 6psi on the rev up motor like mine...

 

Guys, we still got 400whp at just 6.5psi at redline....the customer is happy with the car...just still unclear why some of these cars arent holding boost to redline. Peter indicated that it was exhuast back pressure, however, we switch to a true dual 2.5 inch, and the boost is higher...but the taper at redline is still there.

I am just going to end this converstaion here, since I think all the pertinent information has been discussed.