I am currently in California and my 1986 6.9 idi is smog exempt. I am considering relocating to Franklin, Tn. It looks like I would have to pass emissions testing in Williamson county. Can anyone give me an idea of how stringent the test is? I do not have my fuel turned up to the extent that it is blowing black smog, but the exhaust is really strong smelling and I am in need of new valve guide covers so I do burn some oil. I still have the stock exhaust and it has some leaks and I would like to replace with a straight pipe. Should I expect problems passing emissions?