I had a similar experience. Six of my bolts broke off no matter what I did. Be careful if you drill them out as I went too far on one and entered the oil cavaity (barely). Luckily the shop just sealed it off and put studs in there instead.
When you are done also make sure you tie back the power steering hose so that it never comes into contact with the headers or you will have a fire like I did. The lucky part was that we had it out right away and there was no damage other than the blown hose and fluid everywhere.
Now that they are on (about 10 months now) they do add a nice tone to the exhaust and have been trouble free.
Chris
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1999 986 2.5L, Stock Exhaust (S muffler), EVO Intake, 18" Stock rims (17" during winter), IMS Upgrade, 150k+ miles and counting!
87 944S brought back to life
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