Exhaust mod

  Bit the bullet today and done the exhaust mod on the M800  , pierced both baffles in each exhaust using a pointed piece of 20mm round-bar  and the results----------------- brilliant  what a difference, sounds really sweet now. Now the engine can breath you can appreciate just how much it was struggling before the mod .
Invaluable advise from you guys again          all.

bet that sounds pretty fruity with 20mm through it  

Sounds good John, far to quiet as standard

I would be interested to hear that, bet it sounds so much more Grrrrrrrrr with both at 20mm.   

Mr Intruder wrote:

I would be interested to hear that, bet it sounds so much more Grrrrrrrrr with both at 20mm.   

Yes Dave, nice deep grunt to it now, I think the neighbours might sell up now but      I'm toying with the idea of drilling the back plates now but don't want to overdo it, any thoughts on that m8   or 

stingray i have done the same as you may do the back plates over the weekend if i do i will post back  

DaveK wrote:

stingray i have done the same as you may do the back plates over the weekend if i do i will post back  

Cheers Dave 

I have all three done .Both baffles and 8 - 1/2 inch holes in plates.love the sound. really has a good sound when coming off the throttle.

I can't remember proper, doesn't it make it sound deeper knocking holes in the baffle plate but makes it more farty but louder if you drill the end plates?

It sounds deeper Sim.

stingray wrote:

DaveK wrote:

stingray i have done the same as you may do the back plates over the weekend if i do i will post back  

Cheers Dave 

 John have done the back plates with 10mm thats all my cordless drill will hold now have a nice deeper sound  

DaveK wrote:

stingray wrote:

DaveK wrote:

stingray i have done the same as you may do the back plates over the weekend if i do i will post back  

Cheers Dave 

 John have done the back plates with 10mm thats all my cordless drill will hold now have a nice deeper sound  

  Thanks for that Dave, how many 10mm holes have you drilled in each back plate? 

4 in the top & 4 in the bottom see how it go's may do more

DaveK wrote:

4 in the top & 4 in the bottom see how it go's may do more

 :cmate:  Cheers Dave, I think I'll be giving it a go. You could get a bigger drill & open the holes up more rather than extra holes    

DaveK wrote:

4 in the top & 4 in the bottom see how it go's may do more

  Drilled the back plates this morning 4 x 10mm holes in each pipe, the same as DaveK :cmate:  & I have to say I'm well pleased with the results  , don't think I'm going any further now as I think the exhaust tone now is perfect for me, not overly loud but a nice throaty 'V' twin sound   

  same as you im happy with the 10mm but nice to have the option to go more  

DaveK wrote:

  same as you im happy with the 10mm but nice to have the option to go more  

  Yeah, I'd advise anyone to do these mods as the results are great    a lot.
Thanks again all 

Yam your right innuendo or not i can get the sound i was after untill i have the cash to get non stock
i did step 1 first (punch the platas) used the bike for a bit just to be sure all was ok.
then did step 2 (drill the holes) did 6mm first not that good then 10mm got the sound i was after

the guinea pig i used for step 1 was my old VL125 with the twin pipes got it a bit deeper even on that

Hi Dave K,
Top man for posting a step by step guide ....  
... & quite an easy mod then -    
I can understand why many people are in favour of it.  

Looks like a tapered reamer is the way to go for enlarging the holes - you can get stepped reamers as well - the only drawback with most of the cheaper versions of these tools being that they tend to blunt easily - probably best running them a lower drill speeds - with a battery drill possibly being the best option & take it nice and slow.
I did giggle a little during the punching out of the inner baffles, when Abe 'missed' with the hammer - & must have clonked the rim of the silencer ... OOppps