i know it will reduce compression, i plan on turboing down the road, but a tuned 16v with 8.5 to 1( stock rods and pistons) after a tune with intake exhause, produce more power and torque then my motor stock. its not that big of a deal to me as i have other cars and vehicles to drive so it can sit. and idk if i will ever sell it. i might sell it if i go into the airfoce. IF i go in.