How do the original cans look on the inside?

Like this:



Or like this:



Or another way?

I'm not sure, but what is your goal.
more sound, more power or both.
Personally I would go for an additional set of mufflers.
one for fun (open, absorption-type) and one to meet the regulations (preferred orginals)

Ducbertus

Bump, noone?

My goal w this is more sound & a little better breathing,
just checking all exhaust options.

I've build several mufflers by myself in the past. these were absorbsion type mufflers.
Stainless steel perforated innertube, aluminium endcaps and carbon outertube.
The lenght of the mufflers is app. 450 mm and Ø 90, weight 1,25 kg.

A few guys have been racing these "mufflers" in the Dutch national Supermono cup.
normally the mufflers produced a nice dark sound at 102 dB.
As the noise limit was reduced below 98 dB I stopped.

General, if you want power and sound, go for absorbtion type mufflers.

Ducbertus

some general info worthwile to read once:
http://www.box.net/public/4rd2q3kljs

G.

Some additinal info:

http://www.ducatisuite.com/superbikemufflers.html

Good info, thx.

But,
are the 907 cans like drawing 1 or what?
They seem a little different, the alu tube is not a complete tube.

The black, shiny coating on the mufflers, what is it?
Black chrome or some kind of heat paint?