Backbox fitting

[Jayfidz1990]

When I fit my backbox, do I need the exhaust gunk for it to seal?


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[Mickswan]

I think it's always best to use some, I'm sure some people will disagree. For the sake of a few quid use it.

[Jayfidz1990]

Cheers bud


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[f13sta]

An exhaust is never going to be air tight.
Also due to crap recycled metal. It's even worse. So yes I'd always use some.
Think my kam racing one is the only exhaust I've never had to use paste