I have an mk patrol with an sd33t. motor has done 465000k runs front mount cooler, 2.5 straight through exhaust, 14psi. boost doesn't really wind up until about 2500rpm and i change at no more than 3000rpm due to engine age and i dont think there is much point reving it any harder. i want a smaller turbo so the boost is on at 2000rpm and running out by 3000. can anyone point me in the right direction