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Discussion Starter · #1 ·
I modified a stock exhaust that I bought (cost me 50€ on eBay).
1) you cut the muffler with a grinder (you just need to cut at this place. No need to open the muffler like in the picture)
2) you cut the pipe inside (with a grinder)
3) you cut the external pipe (with a grinder)

Then, you just have to :
- Remove the internal pipe
- Make a weld on the outside of the muffler
- Weld a bigger external pipe (40mm)

The sound is whaooooo ! For only 50€ (thanks to my friend who make the welds !)

The last pic is the stock Exhaust without any modification. See the difference of diameter !
 

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I did this at the weekend - chopped up a spare MT07 exhaust I got cheap, and TIG welded a new larger diameter stainless outlet pipe back on.

what I hadnt realised until 2 weeks ago, the previous owner had drilled holes next to the outlet - covered up by the shroud, I could see them. This is a terrible idea because you then have both the regular pressure pulses going through the full system, and also shortened pressure pulses bypassing one of the baffle chambers.

So anyway, I welded them back up.
Obviously it was then quieter ;) but much more importantly, the engine felt a lot smoother at low revs. So backing up the theory that messing with the exhaust pulses in the silencer is not a good idea!

Anyway, swapped the stock system for my modded system on Saturday, and took it out for a 100mile blast yesterday.
The smoothness is still there, economy hasn't suffered, and the downpipes are still a nice straw colour - so I think the fuelling is fine with it.

more importantly, it sounds excellent! and cost me £35 for a spare exhaust system!
 

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What an awesome idea! A great way to have a better sounding stock exhaust. Quick questions just to confirm... the MT-07 exhaust is the same as the XSR700, but are all the years similar? I have a 2020 XSR700 and was wondering what used exhaust I could get.

Cheers,
 

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I guess only EURO4 exhaust of MT-07 ist the same...
 

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I think it's cool that people are experimenting with their bikes but just remember, modifying your exhaust is illegal and when/if the day comes that you are checked and maybe ticketed for an illegal exhaust you do risk the chance of having to get a new or at minimum, unmodified system. My take is to buy a good exhaust (even if it's not legal on the public roadway) and if you get in a bind, you can always reinstall the stock system at 0 cost. It also makes it easier when selling your bike to have the OEM unit so the new guy doesn't have to worry about being EPA compliant.
 

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I think it's cool that people are experimenting with their bikes but just remember, modifying your exhaust is illegal and when/if the day comes that you are checked and maybe ticketed for an illegal exhaust you do risk the chance of having to get a new or at minimum, unmodified system. My take is to buy a good exhaust (even if it's not legal on the public roadway) and if you get in a bind, you can always reinstall the stock system at 0 cost. It also makes it easier when selling your bike to have the OEM unit so the new guy doesn't have to worry about being EPA compliant.
What kind of backasswards place do you live in?
Fuck the epa.
 

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what I hadnt realised until 2 weeks ago, the previous owner had drilled holes next to the outlet - covered up by the shroud, I could see them. This is a terrible idea because you then have both the regular pressure pulses going through the full system, and also shortened pressure pulses bypassing one of the baffle chambers.

So anyway, I welded them back up.
Obviously it was then quieter ;) but much more importantly, the engine felt a lot smoother at low revs. So backing up the theory that messing with the exhaust pulses in the silencer is not a good idea!
Yeah, but they got what they were looking for - more noise.
 
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