Hey looking to get info on maybe some solutions for my JL to hold about 75mph on the highway. I have a sport altitude unlimited 6 speed with 34 inch KO2s and 3.45 gears. Also just installed a cold air intake. Speedometer reads about 70mph when I am going 75mph but unless I am behind a large vehicle to block wind the jeep will not hold that speed in 6th gear. Barely will hold that speed in 5th gear when climbing small hills. I am in east GA by the ocean and there are no mountains and is mostly flat. Will an axle back exhaust give me any more HP or are they just sound. Also would a programmer solve the problem.