Geez I don't know.....I only changed the oil and ran the valves a couple times a year more for peace of mind, I would get up on the freeway but will admit I wasn't going 75 like everybody else as I didn't like the constant 4k plus rpm's.....but lets not forget there are a lot of Drag Week guys doing that and they mostly have the valvetrain for it and take it easy on the highways unless they have an overdrive.....so it's doable and is done each and every year, I guess from so many not liking 550-600 hp maybe your driving skills have diminished and hey I get it......buy mine haven't and I enjoy that kind of power.....425hp gets boring real quick, I don't drive to the track although when I first started racing I would drive 10 miles to meet up some friends that had a trailer and they would tow me.......didn't mind the drive at all before going to the track but was always leary of deer when I was driving home at midnight or later.