I had port and polished my exhaust ports, i did it to match my gasket, my question is, how much horsepower do you think that i will gain, my mods are simple...
d16z6 greddy turbo,
blue box,
aem fuel rail,
obx adjustable cam..
racing clutch.

 

165 HP.
That's about the same thing I'm running and I had mine on the dyno not too long ago.