Title: Helicoil 9 MM for stripped Porsche cylinder head exhaust studs
Product review: As expected the quality of the inserts is top-notch. The steel installation tool was new to me as I had previously used a plastic tool from a kit of 8 MM kit purchased at a NAPA store. The steel tool seemded to make getting the insert started more difficult by not allowing it to "give" where the old-style plastic tool allowed the insert to stretch just enough to begin to thread in. 3 of the inserts were ruined in the process and I used the plastic install tool with success. Once started, the new thread inserts worked great and my exhaust system is nice and tight and leak-free at the heads. I did this job with the engine in the car so the extra length of the steel tool would have been nice.
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