Thanks for the advice guys, I got round to drilling the holes over the weekend and I must admit while the sound isn't THAT much different it sounds pretty cool at low revs.
So overall it doesn't do that much except make it sound a wee bit deeper with a bit of grunt, so if you are keen to try it then go for it, just make sure you don't fuck up your warrantee if you are going to do it.
What I did was:
1: Cut out the template and put small holes in the template which I marked with a silver marker
2: Drilled with 5mm drill bit
3: Enlarged to 8mm
4: Went for a ride
Cheers
John
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