If you are mechanicaly inclined, you can buy a port and polish kit from Summit for about $25. It took me about six hours on each head, but I'm a little more peticular than most. I was verry happy with the outcome. On a stock 88 gt with the only mods being a new timing chain, timing set at 14, underdrive pullys, long tube headers, and the ported factory heads. The car ran 13.71 @ 101.4mph. That was with the factory 2.73 gears and 225/60/R15 tires.