I put new heater boxes on my 1973 super beetle and I am still getting an exhaust smell in the car. Just wondering if there is something I am missing or anything else I can do. Thanks.
make sure you check the connections between the boxes and the muffler... I had the same issue last year and found some holes in my boxes and less than tight muffler connections.
gooped muffler paste or whatever that stuff is and tightened the clamp/gasket down. Hopefully that will take care of your issues
Something I have never ever had, an exhaust smell... You can use Silicon on all the gaskets, both sides. I have been using SILASTIC on exhausts for about 10 years, since I was informed that it could be used on exhausts and extractors by a Guy who worked for many years at an exhaust repair shop... otherwise I would have never thought of using it. I have been using Silastic for many other things but didn't think it could stand up to the heat... but it does... No problems. One thing I do when using SILASTIC, is I cover the gaskets on both sides and then put them in place, BUT I don't tighten the bolts or studs for a few hours, so the silastic goes hard and You get a good tight connection/sealing surface... Of course it probably seals just as good if You cover the gaskets etc with a thin cover of silastic.
LEE in Australia with 38c degrees.