I started removing my stock H pipe today and what I thought would be a pretty easy task turned out to be quite difficult. I put a cat-back on last year so I knew those nuts would be OK. First issue, one of the studs came out of the header collector! Second issue is the aluminum tubing that goes into the back of the H pipe would not come out!!! I ended up using a dremel tool to cut it off.
Once the H pipe was out I tried to get the nut off the stud but to no avail! I sprayed the crap out of it with WD40 and I'll try again tomorrow. Any other suggestions? I got under the car again to get the rest of the tubing out and have had no luck. The clamp is loose but it will not budge! You think a propane torch would help? Any ideas?

Once the H pipe was out I tried to get the nut off the stud but to no avail! I sprayed the crap out of it with WD40 and I'll try again tomorrow. Any other suggestions? I got under the car again to get the rest of the tubing out and have had no luck. The clamp is loose but it will not budge! You think a propane torch would help? Any ideas?