| But it will affect fuel economy a bit. Here is the basic break down with 275/35R18 70 MPH stock gearing RPM is 2554
70 mph 4.1 rear gears RPM is 2836
70 MPH 3.3 rear gears RPM is 2283 (mostly cruise at 80 at this point)
70 MPH on Cusco gears and factory rear end is 2805 RPMS Here is a image showing all the different options including the Cusco gearing. The cheap and easy way would be switching the rear gears to have a postive affect. It will make the car feel more responsive as well but probably nose dive at the top end. I personally like the Cusco gearing and custom rear end :-) But it would be a nice upgrade just make 1st gear even more useless but 2nd thru forth would benefit and really help make the car more fun. I think there is a good need for a 3.37 rear end as well. 
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it actually won't be to bad for majority of people here - 
