Is Rust Bullet recommended for use on an exhaust system?

No. After curing, all Rust Bullet coatings have a service temperature range of 314 F (157C) continuous, and can tolerate maximum temperatures between 617F (325C) for up to 72 hour periods. Rust Bullet provides excellent protection for most engine components; however, is not recommended for coating exhaust systems due to the excessive heat produced on headers, exhaust manifolds, catalytic converter or exhaust pipes.