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Anyone tried this exhaust mod?

4834 Views 3 Replies 3 Participants Last post by  Domster

It seems almost too simple a way of getting a fruitier note without dropping £500 on a new pipe... has anyone had a crack at it? What's the worst that could happen?
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I dont want to view the video, but I assume its the same as this?

I did it. No regrets. And also no inclination to buy a new exhaust system now.

If it's the simple drilling holes mod, then don't... it sounds crap and messes with your low end power. I know this from experience of the previous owner doing this, and when I welded it up, it made the engine much smoother.
What's the worst that could happen?
Yep, the video is the one with 6 holes drilled in the box near the exit pipe - not recommended as it does, apparently, interfere with back pressure, resulting in poorer low speed performance. Munkul's solution is a bit more radical and involves cutting the box, removing an internal pipe and re-welding the box. Personally, I'd still be a bit concerned that it would change back pressure and mess up performance, but I'm happy to be proved wrong. I would play safe and buy a fully tested after market system - look out for a perfect second hand system from someone who's selling their bike. What a pity that Yamaha's engineers didn't design a better exhaust note into the system at the outset - Ducati and Triumph seem to manage it!
Fair enough! Like most things that look too good to be true, it appears that it is....

I guess that at least the better-branded aftermarkets like Akra, Yoshi, Scorpion etc take this into account.
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