How about one of these?
http://m.summitracing.com/parts/wlk-35891
We use them at work for reshaping exhaust. Would work great I think for what u need to do
@dazzrie started
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How about one of these?
http://m.summitracing.com/parts/wlk-35891
We use them at work for reshaping exhaust. Would work great I think for what u need to do