How long do you think it will last???

well bad news fellas, the mach1 sold today : ( but i guess that is a good thing...i have a sct xcal2 and when he tuned it (i paid for a dyno tune) he set the rev limiter to 6700...i usually shift my car when racing right at 6000 rpms....is that putting too much pressure on the engine?? if so, where should i shift??? i made up my mind...i'm going to be getting a p1 with a 3 core intercooler...when i get that, i will get it tuned. should i shift the car around 5600 or what??

ps. i do have really low mileage for a 2001...just went over 69,800 today...
 
the guy that will be tuning my car is well known throughout the south...James Weaver from RWTD so hopefully he can do a good job...thanks for everybody's input...i may try to locate a mach1 around here through my dealership. only time will tell if that will work out