Has anyone cut out the diffuser in the exhaust port of a N/A rotor housing and grinded away any of that hard *** metal to port the exhaust? If so, what did you use?

 

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I remeber a post saying a cold chisel works really well. I, myself, just bought TII Exhaust ports.

 

and Puerto Rico we use to do a real exhaust port... and take that crap off

 

Use a die grinder to thin out the metal, then hit it with a cold chisel, Shouldn't take more than an hour.

 

I didn't search at first cause I didn't think anyone would go this route. I found more threads than I thought I would. $400+ is too much to pay for rotor housings. That is probably why mazdatrix doesn't want us messing with the diffuser, so they can make $800+ per pair of housings.