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Steel wheel boosts slower than the titanuim aluminide (I think)wheel due to weight and inertia. They make the same power, but theTiAl gets to max HP#s a little sooner.
With the torque these things makemost peoplearent going to notice the difference. I have the steel wheel and it spools faster than any street tire can take anyway. From everything I have read it is only like 300 RPM difference.
I have seen steel wheel vs. tial wheel. Get the tial wheel. On top of that it will take you at least 6 months to get your kit if you go with the steel wheel. They actually have to take one w/ a tial wheel, rip it open, and throw in a steel wheel. They have tial in stock, not so much for steel....