I wouldn't bother with the exhaust. My brother has just put one on his, and it's made it slower.
A better mod is changing the roller weights.
There's a burgervan forum, if you google it. It's 'mercin based, and most of them on it are god bothering losers, but there's a couple on that have some knowledge. I was going to get a LV can for mine. $550ish, IIRC. The J Costa Variator seems like a better investment to me.
It's only when you take the piss out of a partially shaved wookie with an overactive 'me' gene and stapled on piss flaps that it becomes a problem.
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