Replace 1 7/8" pipes by 2 1/4" on a 6 cyl.

Dart/Valiant said

I read the Exhaust Manifold Mod, great work! But still wonder what tool he put on his hand grinder.

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I can tell you exactly what he used. He used this with about a 1" x 1" cylindrical rock on the end then finished it up with a flapper wheel.

Pneumatic 1/4 in. Die Grinder with 3 In Extension