IT took 6 hours. i just got my exhaust done yesterday and if it wasnt new i could see how the sound would get old on a long trip but i loved it tonight. I was cruisin at 80 most of the way and it ran great. i also have the stoc airbox removed. the only stops i made were twice for gas. the seats were comfortable the whole way. this car is great for road trips in my opinion not only to drive but the trunk is rather large too. I took it up over 100 plenty too and the thermometer never even made it to the half way mark. Before the intake/exhaust i think it would run at the half way point but now it runs a little cooler it seems or maybe it was jsut cuz it was at night. But for sitting in a car for a lil over six hours driving the whole way in a straight line up the 5, i would say the redline is definately worthy of taking on the long hauls. Also how large is our gas tank beacuse i got 237 miles to one tank.