Hi everyone I just installed a 2.3 Whipple 624hp kit with the 3.25 pulley which is good for 9lbs of boost. My issue is when I floor the car my boost gauge reads 9-10 psi for a half second then falls to 6-7 psi fluttering back and forth holding there till redline. The car feels good, I don't feel any belt slippage and checked my connections for boost leaks. Is this normal? I have a off road h pipe, could the less back pressure cause me to boost less psi?
Your advice is appreciated thanks!
Your advice is appreciated thanks!