Originally Posted by Just Dave
You're trying to go sub 10's with 2.5" exhaust?
That won't affect your boost. The reason boost is falling off in the upper RPM's is because the blower isn't able to keep up with the air demands of the motor. Its able to at lower RPM's because the air requirements are less at lower boost and lower RPM's. You're simply out of air with that pulley.
that was the exhaust system that was on the car before we decided to go crazy....we have a new one its just not on the car
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