It depends on your motor's redline. If you have a high reving motor, the .63 will benefit more because it will still have power highend.. the con is the lag. If you have a low redline, go for the .48 because you wont need the extra highend the .63 provides plus you'll spool quicker.

 

ok i redline at 6800 and revlimiter at 7200. what turbo would be better. how much lag are we talking about? when do you think that boost would come online? on a B18B. ok thanx

 

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.48 turbine for B18B/B20 or D16's with the 6.8-7.2k redline.