Honestly... Before 500 miles on this car I popped my tach up to 6k a few times and I'm not worried at all. Do consider though, that the car was completely warmed up and I gradually kept building rpms at about 1/4 throttle. I was easy on her till 1201 miles - 4k miles. I went easy on her again because for some reason every time I drive my car hard I just want to get MORE and MORE mods. Christmas is leaving me poor. So I must ease off the throttle