Alright my mechanic/friend is telling me to "pocket port" my head(exh side) and TB. He's telling me that by stuffing a rag in the head and opening up the exh ports 3cm or so and doing the same to the TB(elbow...stock on a 93). I will get large HP gains. Now I know porting the turbo o2 houseing and exh manifold will give signifigant gains but Is the "Pocket port" really going to help? Will it hurt the car in any way?? I'd of course port the manifold and turbo to match.

Thanks again