I paid 250 Euro's for the conversion of the exhaust (www.evamotor.nl) and it uses the original collector. Therefor it keeps the Kat, but it makes the engine run much smoother. There is no problem on overheated tires or swing.
The Bike is chip-tuned, K&N intake etc etc
The sound is just a bit heavier and at speed totally not disturbing (I had a Y-pipe with Remus Titanium open, now that was really loud!!!)
I will admit that with a complete open system, this bike runs fast, but this is a very good compromise. And it does give the bike a good look.
Having seen the Wuedo... Well it looks more finished, but i have to mention that Eva Motors does have a similar solution like this, but I did not have the money to buy that one
Well, the kat filter is on the first part of the box. The rest of the original box is filled with reflectors etc. The guy cut off half of the box and replaced it with a new reflection damper in rvs.