Title kinda says it. I just discovered an exhaust manifold leak in my ‘91 Miata, thanks to the magic of Seafoam (ultra smoke formula). How urgent should I make the repair of this? I might be able to get new headers in several months, and if I go that route I’d rather not replace the gasket right right now. It’s not like I ever sit and idle in a closed space where the exhaust would build up, but is there a solid reason to treat this as an imminent hazard vs. a nuisance?