Reviewed By Dennis P (Cripple Creek, CO) Reviewed for a
—3/27/2012 12:00 PM
I live at 10k feet in Colorado. I am now able to climb some hills in higher gear than before. These are hills that I always struggled with not being able to climb in one gear and down shifting was just to much and high rpm. 93 Wrangler 4.0, manual, 30x9.5x15, K&N. Great torque 1k-4k. Haven't checked mileage, have to fun playing, but seems better. My son put a Jet spacer on his 95 4 cyl wrangler and we did not see this significant of an improvement.