First off, when i am driving it is getting harder to put the car into gear and the clutch seems stiff all the time. The clutch is not slipping but i think it is starting to go. The car is an 02 mustang gt with 46k miles. Is there any ways to test to see if the clutch is going? If the clutch is going, what is a good after market clutch and how much to have it installed? Also, I put an xpipe in a few months ago and the check engine light keeps coming on. I had the codes pulled and it was the 02 sensors but when i reset the battery the car will not throw the code for a few weeks. Is this normal? I would think the code would be thrown all the time if its the x pipe. Any help would be appreciated.