Installed my XRC MOD Stubby the other night. Driving into work the next day I noticed a drastic change in MPG and handling. I assume this is due to the aerodynamics in the front of the vehicle and not so much the weight of the bumper since I don't notice any front end sag. I didn't think the factory bumper cut that much air from the front of the vehicle. Thoughts?

 

it's amazing what a difference those air dams make. If you removed the big one that sits behind / under the front bumper I would expect it would make a noticeable difference.

 

A drastic change in a good or bad way?

 

I've never had the air dam so when I put on the MOD my mileage actually went up!

 

Drastic in a bad way lol. I have my tuner set to mileage with the stock pedal response, it drives best on those settings and mpg went from 22 to 19 average hyw.