1. Call Pentroof and ask how many they have had cracked.. They have said none.2. I have installed many of HKS SS manifold son Supra and known of some supras with manifolds over 8 years old and still haven't cracked. Well over 60K miles on them some over 100K. I can't count the number of SST manifolds used on drag cars, circuit cars and etc that run SST exhaust turbo manifolds without a problem. 3. There is no such gaurntee on anything. What makes you think that GD won't crack either? My counter is what makes you think that they will always crack? How postive that they are not a bad design versus bad material.

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