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321 is pretty heavy duty stuff as far as temperature limits. Even better than 304 and a lot better than the 409.
 

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about the band clamps, i think they have a hard time compressing 304 stainless as well. i battled leaks at several connections and even sheared an exhaust clamp bolt when messing with them. it took A LOT of adjusting and elbow grease but i managed to stop all the leaks with the original clamps that came with my American Racing header system.
 

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Discussion Starter #7
You are correct, it is very heavy hence the need for the band clamps.
We stripped the threads on the included clamp bolts.
BillySpeed opted to use the band clamps I pictured in the write up.
The other option would be to just replace the included clamp bolts with grade 8 bolts.
So either method will work.

SOPMOD...OUT!

321 is pretty heavy duty stuff as far as temperature limits. Even better than 304 and a lot better than the 409.
 
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