[ollykiwi3]

gidday all
I am also building a project with underfloor mufflers.same reasons as most i guess,asthetics and noise. I have found some edelbrock mufflers which fit mine, between main rails and outriggers. using 2 1/4
" pipes all the way to back. I have a jag rear end and have manages to fit mine under the centre of the diff and then 90 deg out to rear end. all very tight, but I have built all myself, so was able to fit how i needed it. My biggest problem was,and still is with the floor to muffler clearance. I have a fibreglass floor, and only about 1/2" gap. I have just put on a heat shield by ACL Australia, but havent run it for long enough to see if it has improved.I see there are a few of us crazy buggers trying to do this, but has anyone got similar clearance issues and heat problems with the floor pan, and if so, do you have a remedey??
i am more than happy to spill the beans on what ive discovered to save someone else the grief.
I have to cut my outriggers(4"-3" c section) with a slot on the bottom web, then install a piece of half round(not quite half round) to go around the pipe for clearance. I too tried to keep it all above the bottom of the rails, but its not possible. centerline of 4" muffler is2", and if main rails are 4", that leaves no gap above muffler. the whole system has to be moved down a bit, or run those spintech mufflers to allow a gap. I didnt know they existed ubtil today, and they are too expensive for me here in NZ.
Anyway, what a ramble, but was really hoping someone could advise on heat shield issue, and I can help with you not making the same mistake as me.
cheers