Well port & polish is not a big plus, but it does help w/ engines driveability. Improved A/F, gas Mileage etc.. it will add a couple extra ponies, if you plan to ever go turbo, do & mild port & polish don't waste any extra cash you don't have to. If you got the cash just upgrade the vavletrain while your at it. Pm me for some prices on vavletrain!