i have a 05rxt, making 7.2lbs boost@8050 rpm @81deg. does any one know how much the riva performance impeller will raise the boost.isee thiers a overdrive gear set on the market is this to spin up the impeller faster,if so with aafter market impeller how much much moor boost is thier thanks for any help with this?

The overdrive gear is for the GTX SC models. Your RXT already has this gear set in place from the factory.

The Riva/Vortech SC impeller add's about 1 psi of boost, but delivers much more volume of air than the stock SC impeller.

You will notice a difference in acceleration with the Riva impeller, but will notice little if any gains in top speed.

Its well worth the money!

ok,, thanks for the reply, if thies adds just had a small read out about what some of the items are what they do it mite save alot ?

Thanks for the input about our ads. It's tough to squeeze all that info into an add without cluttering up the page. That's why we offer detailed information about each of our kits and the parts they contain in our Performance Packages & Modified Craft section.

If after reading through the information provided you have any questions please be sure to post them. Thanks!