75 76 were notorious for rotting out. We have several new setups but are developing a stock replacement so are keeping for r&d
I would suggest for now to weld and when we get stock, then replace. the 75 76 system was hastily designed and not good, many have retro fitted the earlier 2.0 system, heat exchangers, muffler, bracket, j pipes, branch pieces with great success
QUOTE(gturner008 @ Apr 24 2020, 08:29 AM)
Many thanks - good advice. I'm keen to find an OE type stock back box. Not sure where I'll find it. I want to keep the car 100% original - therefore probably won't go down the aftermarket route.
I'm not surprised to see a muffler with a hole. A miles, infrequently driven car is more likely to have exhaust rust - given the condensation cycle associated with this sort of driving pattern.
I know it is hard to believe, but I've now been over the entire car - above and below - and found no rust at all. I'm very surprised to be honest I expected to find some rust somewhere. But no - nothing at all. Not even a pin prick of rust.
The Zeibart treatment the car got from the dealer was extensive. Included black stone guard inside the fenders, spray of clear wax type materials over the entire underside, wax filled cavities, and a liberal spraying of wax on all chassis, suspension and engine bay area. My plan is to clean, but not remove the treatment. I could get rid of the wax materials - and make it all shiny, but I don't think that's the right approach. Better to look a less shiny, but retain the originality. A tough call.