If you have an external wastegate and if you're not hitting target boost numbers and overall lacking power, then this could be an indication of a torn wastegate diaphragm. Yes, this is a thing in Tial wastegates. Although common on big horsepower cars like the MKIV Toyota Supra, over time the wastegate diaphragm can develop a pin hole leak or even a larger tear due to heat or continuous use. Not a problem if you run into this issue as RallySport carries diaphragms for the Tial MV-S and for the 38/41/44MM wastegate. And if you need other wastegate components, then we have what you need. Make sure you check out our great selection of wastegate seats, wastegate springs, and wastegate fittings to make sure you have all the right parts to keep on boosting.