Quick run down:
Long Tubes 2210 (coated)
3" Mufflex Y pipe (chopped/dinged/weld to fit around a Spohn TQ Arm)
4" exhaust (built by myself using cheap 4" pipe, some 90* bends, and cheap Hooker AirFlow straight through muffler)

The Y pipe seems to make the trans tunnel area hot. It's pretty close to the tunnel bracing area to get maximum ground clearance.

I thought about using exhaust heat wrap on that section of the Y Pipe to keep the heat off the Trans Pan and off the underbody. Would I experience metal fatigue if I did wrapped it? I'm hoping to lower some exhaust temps inside the car. The shifter actually gets hot to the touch after driving for 15-20 minutes.

I still haven't reinstalled the o2 sensor for the A/F ratio gauge due to not having a bung on the system yet. It's heated 3-wire type sensor. Would it still heat up and function correctly if I could put it in the merge cone section of the Y pipe? I thought that might be nice to see both banks, not just one.

 

if ur shifter is even getting that hot, i would move the pipe a little farther away. or at least but some wrap on just the top between the pipe and tranny. not around the whole exhaust maybe just that section could work.

 

and the wideband i would put it right where the y connects