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Pay attention to what has been going on with the G54 for years. Paying $1500 for a turbo will make you no quicker or provide better response than a well matched $250 holset or even an ebay job for that matter. The quickest street 2.6s were all "dinking around with cheap turbos".... figure it out Turbo is not where the magic is imo. Chasing "big G54 hp numbers" will be a lesson in inefficiency at best.... then there is the risky business of reshaping your torque curve. While 352hp @15psi is commendable, a tbi car with much less into it, dyno'd ~350 @18psi. That 12.4sec street SQ (60-1 @13psi) had to be up there I reckon. 60-1 has dyno'd 407hp @19psi. The point is, something as trivial as a dyno reading or a better camshaft, can make all the difference (as the 350hp tbi car demonstrated). That's why many of us stick to proven combinations with ETs... where the bs stops.