The most common troubleshooting question we get is this:
"My car is not running well. When the boost starts to come up, it bogs, coughs, and black smoke pours out the tail pipe. What's wrong?"
There are a lot of things this could be, but most often it is a leak in the intake piping between the turbo and the throttle body. We see this very often after a customer has installed an intercooler pipe upgrade; the clamp is not seated right and the new pipe is leaking at the coupler.
If you've recently worked on your car and now it's behaving as described above, check all your i/c pipe couplers.
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