I put this on my 2011 Jeep Wrangler JK Unlimited to improve gas mileage but more importantly to improve the horsepower. When putting it on I had to use my own bolts because the bolts provided were just a hair to short, luckily I had some that worked or it would've sent me in a tail spin (try to go to part store with no vehicle). I noticed the throttle response improved right away and it feels like the horse power has increased as well. I have had it on my Jeep for more than a month now and my gas mileage has not improved but I believe it is do to my driving habits have changed with the better throttle response. I give it four stars for the workmanship and quality for price. It's not going to make your Jeep a race car but anything helps the stock 3.8 which really is a dog. Taylor Cable appears to be a top notch company but the bolt issue still resonates "what if". Product was received in three days.
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