Exhaust Sleeves - Pros & Cons?

[TigerRuss]

I hear there is a very simple way to improve the glorious sound system on the Tuscan - by 'sleeving the cans'
What does this entail?
Does it effcet the warranty?
Where can I get them from?

Thanks for your help

[TigerRuss]

Thanks ajvmoore

Not got my baby Tuscan yet, just exploring the options.
I'll have a play when it arrives.

Russ