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I recall seeing a topic about porting a TPI. The hole procedure whas to port the base, and siamese the runners. I think it whas orginial a topic from a camaro forum. Could annyone help me find this?
This link has alot of useful info on making an adjustable f.p.r., polishing aluminum, porting the plenum, etc. No info on siamesing the base on this link, but some good info. http://www.gmtips.com/3rd-degree/dox/tips/tips.htm
I used an air die grinder with a nasty looking wood rasp type tool to do mine. You could use a dremel tool, but it would take 10X as long to do.