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Discussion Starter · #1 ·
I bought a m4 slip in, took fof exhaust, made the cut, but the pre existing pipe won't fit into the new M4 clamp. So I grinder down the outside to make sure it would fit; however, now it is the inside of the pipe that is too small and won't fit over the inside pimp within the clamp.

Any recommendations on grinding down the inside of the pipe? TIA
 
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