Originally Posted by 04sonic
It only bottoms out on certain entrances to places
My exhaust would scrape on taller speed bumps when I was at stock height. It would scrape where the midpipe and cat back would connect to each other. I think it's the brand of off road H pipe that I have. It just comes down a little lower than others. This could be what's going on in your case too.
On Mach 1's, it's about 3/4" to 1" drop and the 01 Bullitt, it's about 1/2" to 3/4" drop. The Mach's are 1/2" lower than the GT's and the Bullitt's are 3/4" lower than the GT's. If you have a GT, it should be right around a 1" drop with the stock ISO's. If you use aftermarket ISO's, beware that it could mean the drop won't be as low. I've heard that by many.
An alternative could be that you take it to an exhaust shop and let them cut the exhaust in certain places and re-adjust where it sets. Then, they would weld it at those cuts and not alter you bolt-up connections. I'm going to be looking into this when the weather gets nicer.