Hillsborough County schools get out May 25 for the summer break. ChaCha on! 7 years ago
Â· just now. Report Abuse. A cast iron manifold will expand and contract, the JB Weld will not. I think JB Weld is fantastic stuff (have some as we speak) but not for a cracked exhaust manifold.You can always check out their website: http://jbweld.net/index.php I only have experienced JB with cast though, if your manifold is another material you may get lucky.ource(s): Q: Will J-B Weld work on an automotive exhaust? A: Because of the extreme temperatures of exhaust systems, we do not recommend J-B Weld for use on exhaust manifolds and catalytic converters.
NO every car don't have one, and no you wont benefit from it.. The Y pipe joins the left and right manifolds together into a single exhaust pipe on V engines like V6, and V8 engines. The Y replaced dual exhaust to cut down on cost and OEM routing of dual pipes all the way out the back.. Only 1 exhaust pipe, needs only 1 muffler, 1 cat converter, less space used, etc.. Thats why car companies mostly went to the Y pipe..