I havnt been nice to my car, I do regular maintaince, but I am pulled in alot of dirrections for work Military duty, visiying friends, and the occasional all out when the feeling hits, and the track. Like I said They need replacing, but the PRC golds(duals) have been great and have gone beyond TSP probley has thout. Not recomended cus I am expecting a break, but Uncle Sam has been nice to me for a refund so LME will be getting a call for a 416, I will be reusing my TSP LS6 2.5 heads I got a few yrs ago. Been thinking of reusing my MS3, or the Vindicator(already have) with a 1.8 rocker ratio retarded 2 degrees.