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Does anyone know why the rear section of the exhaust pipe is so long? It goes inside the front part of the silencer for about about 240mm instead of just enough for the silencer to clamp up on it.

The reason for asking is that I am going to make up a less restrictive absorbtion-type unit, along the lines of the original silencer, but at the moment the long rear part of the exhaust pipe would internally mask about 40% of the perforated pipe that I will be using and make it too loud even for a track day.

I know I could cut the standard exhaust pipe down but I am reluctant to do this in case it would cause running problems, when I wanted to change gack to the standard silencer from time to time.

Any help would be welcome.

Those people who like a little more power at higher revs (aka racers) sometimes cut away this long tube.

See http://www.motalia.de/saturno-kruemmer.html

The red curve is with the short tube.
The blue one is with the original header pipe. Gives a little bit more midrange.
What i would prefer. So i swapped my cut down header pipe to an original one

ciao Joachim

Thanks Joachim, very interesting.

I certainly would not want to lose any mid-range power on the road as there is not a lot anyway. The answer I guess would be to have both long and short exhaust pipes and use the short one with my "race" silencer for track days and the standard set up for the road. Just as well I found this out before starting with the hacksaw!!

Regards
Geronimo.