yes, expensive. yes it looks cool I put them in, took about 30 minutes, no instructions needed but they are in the box. Adds a slightly open sound, hoarse like Darth Vader. Throttle response is slightly sharper and faster uphill. I bought a greased filter, I do this with all my dirty bikes, my jeep and my 71 challenger, it's nice to be able to clean and store. Haven't looked at the mileage yet so can't rate it but it's the third destination but will update later after a few rides. I used to get 15.3 around town with my 09 Ram 5.7 if I liked the Flashpaq Eco Tune. With an octane rating of 93 hp, the city received 15.1. Towing my bass tracker into the Central Idaho mountains returned a 14 to 15.5 in eco or tow. The non-towing Autobahn at a steady 80 mph got 17.8-17.9 in the factory setting and the Eco setting got 18.5-19.1 with the same Autobahn at 80 mph. If that gets me 1-2 mpg, I am happy. Oh, and if you put your mind to it, it sounds cool. Pair it with a Magnaflow muffler and it sounds like a real truck. I mainly use it to haul toys and camping gear, I like to pass people with trailers and boats going uphill, it's fun. :)
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