Yeah I did it a while back. it wasn't too tough. I just used a 90* die grinder w/roloc wheels starting w/80 grit and then red scotchbrite and then blue scotchbrite. Then I used a bench grinder with a poilshing wheel. I could polish the end tanks really well but had to DA the top of the intercooler in stages as high as I could go and then just hand polish it the rest of the way. Sold it on E-bay after I switched to the front mount.
ADAM