10.5 CR is ok with boost as long as the car will be well tuned. About the turbo kit, why don't you just piece on yourself. Get a good manifold and a turbo that fit your application. Stay away from drag manifold, it is known for boost creep. The wastegate placement is on 1 cylinder only. If you want log manifold, get Revhard, Blox, Inline4, Spoolin....And if you have more money, get the equal length like Neukin, Lovefab, Full race....There are so many good ones out there. Full race ramhorn manifold is very nice but will cost you an arm or a leg.