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If you have some reason to think there is an issue with boost leak, you
should do a leak test. If you still have reason to believe there is a leak
even after a leak test has been confirmed to hold pressure, you should
go about eliminating any possible variables until you are either satisfied
that no leak exists or a leak is found. So, start with a leak test. If you
need help past that, feel free to ask.Now, the safety rant:
You should always be using some sort of aftermarket boost gauge if the
boost is raised at all for safety reasons. It may or may not help in
identifying a leak (depends on the leak's size and your ability to notice a
change), but it will ensure you aren't overboosting the car and risking
lean conditions. Of course, a fuel pressure gauge is equally important
for safety. But, personally, I'd want a wideband O2 sensor (or two) as
well. That way you'll have a pretty good chance of catching any fuel and
air related issues before you toast the motor.
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