Warning For Unwary

[skylinecouple]

Some time ago I installed a dump pipe that was made by a friend.All was well til I recently tried cranking up the boost on the dyno and at 17lbs the boost was quite eratic.Dropped it down to 15lbs and back to normal.Turns out the waste gate lever was hitting the bracket that mounts the heat sheild on my GCG hi-flow.Why? Because the flange was half the thickness of the standard dump pipe flange.This moved the heat sheild bracket 4mm closer to the waste gate arm stopping it from opening more than 1/2 way.Used spacers to move the bracket and presto,back to normal.On same boost car now revs cleanly to redline and very noticable power difference.No boost fluctuations on higher boost either.