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| Joined: | 03-11-2005 |
| Location: | San Anselmo, California USA |
| Posts: | 983 |
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Replacing the header-to-manifold gaskets is one of the most painful and thankless tasks on the JH. If you don't have popping in deceleration the gaskets are probably good. The larger diameter tubing and free flow mufflers are louder and you may need to add another resonator in the system. The original system had resonators and mufflers from front to back.