Drill holes in Exhaust

Sorry if this has been covered before , but i can't find it.
Has anyone drilled 4 holes in the back plate of their exhaust ?
I have seen many videos on YouTube and it looks simple enough , but my C800 ( 2006 ) performs well enough , i just want a little more deeper sound. Less like a sowing machine ! Some reports say it works , some not. 
Has anyone with a 2006 C800 done it without loosing performance or needing other modifications ?
i don't really want to go to the expense of a new set of pipes. 
Some videos show removing the baffles , some stick a bar inside to remove them.
All I'm thinking of is just to drill 4 half inch holes in the end plate for better sound without effecting anything else. 
I'm not worried about UK MOT legislation as I'm in Cyprus and its ok here. 
Thanks for any advise

There's a section in 'the Garage' about exhausts and 'Salona' posted some pic's back in Jun 2015 when he drilled the back plates on his.
Most folk drill the baffles and also the back plates - makes a great noise without being offensive.

Did the mod today . 
i drilled 4 holes in each end plate , 13mm . 
Sounds better and still performs the same. 
Not sure i will push my luck to do anything more , this will do for me :)

Simila wrote:

Did the mod today . 
i drilled 4 holes in each end plate , 13mm . 
Sounds better and still performs the same. 
Not sure i will push my luck to do anything more , this will do for me :)

Hi!
I'm thinking of it too. I've a m800 (2007).
Since your doubts have been posted for a long now, can you tell if it was worth it? No problems what so ever?
thanks

AS long as you use a 20mm rod through the 2 main baffles & drill the 4 or 6 holes in the end plate you should have no problems. Only problem is if you destroy the Cat' then you'll have some small problems.
If your bike has a K&N filter fitted then it will breathe ok but if you wreck the CAT then you'll need an ignition pack to alter the timing etc ok?

Piercing the first baffle is simple, when you feel the point of the bar touch the second baffle put a piece of tape on the bar about an inch above the end of the exhaust, you'll then know you've pierced the second baffle without going too far, the 'Cat' is several inches past the second baffle so you should have no problems, trust me, you'll love the difference it makes, good luck

Removing the cat produces no problems on fuel injected models. I've done it twice on C800's, with much of the cat removed. As long as you add some kind of lollipop to create a bit of back pressure. But it won't harm the bike with the pipes hollowed either. I ran HH short shots for a while and they are straight through. Hollowed stock pipes with some kind of DIY plate produces loud, almost aftermarket sound with no problems. With carbs you may need rejetting but ECU compensates on FI if you don't change the air intake as well. Adding an X-TRE will smooth things out on any set up but is not essential. With pipes and intake change, a fuel processor is usually required. If you have FI and want to saw, drill and bash you can do to your heart's content. I did, with no problems. But it's your bike - if you feel a bit is enough then no probs!