I WOULD NOT grind down welds on the SS exhaust.... they'll tend to crack. SS expands and contracts more than mild steel.
The SS exhaust on my roadster has a hairline crack at almost every weld (butt welded) joint.. it was ground down and mirror polished. I will have to re-do the entire system.
Talking with Roy Brizio about this -- he said they no longer use SS for exhaust and if they do they NEVER grind the welds.
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