Harbor freight die grinder, I used autobodynow ebay burrs and trickflow sandpaper. $100ish in tools and alittle bit of my time.

20160726_225553 by Corey S, on Flickr
20160801_165651 by Corey S, on Flickr

Its all easy to do
20170223_113842 by Corey S, on Flickr
20170223_121750 by Corey S, on Flickr

**** I even polished my valves
20160821_180704 by Corey S, on Flickr
20160902_152021 by Corey S, on Flickr
20160902_162014 by Corey S, on Flickr20160902_161944 by Corey S, on Flickr




So save some money, enjoy some experience and gain power because your not gonna gain 50hp vs diy porting vs any vendor.