Originally Posted by dynamicS

Well your not compressing the air that much on the low boost system, probably 6 psi. The thing about the roots blower is they operate better at faster speeds mostly due to the gap sealing of the rotor against the housing, this is another reason I'm going centrifugal. If you get crazy your can change the pulley to 14 psi but you might want to order the AMG 32 pistons. That should get you up to 330 hp. After that the AMG cams are optimized for boosting, so you might get another 25 hp.