I can see what Sinfix point is, hes advising you not to trash the SR motor because its more than capable of doing what you want.

However, you guys need to learn what Volumetric Efficiency is and what it means in relation to making peak torque or power. Its much easier to achieve power with a bigger motor, provided you can reach peak VE of course.

TECHNICALLY a 600whp SR vs a 600WHP RB26, which one is faster? Assuming all things are equal (which they arent), rev line, gearing, turbo size, etc, the RB26 makes the power much EASIER because its a bigger engine, it prob operates at less VE % than the SR20 as well.

This doesnt mean bigger is better, and it doesnt mean smaller is better, or than an RB26 is superior. It just means in general terms, the bigger motor makes the power easier, all things being equal.