sorry paul a borg warner turbo is alot more efficient than any thing u listed , go on supra forums and talk to the boys that make real power a borg-warner is what they will tell u , a the gt series ball bearing turbo's are crap , u pay all that money for 2-400 rpm quicker spool and you can't rebuild them .... u cashed one out , tell me they did'nt bend u over to get a new one