Please turn to page 32 of the DDK bible

912uk · Post by **912uk** » Mon May 31, 2004 9:23 am

I am refering to the the mag VW Ultra...

Question the yellow about town bug pictured with a supertrap exhaust ....

I have one of these on my 912E and I noticed the silver end cap fitted to the exhaust. And the comment it is very nice and quiet...hmmm I have one of these I must be doing some thing wrong . As when I start my car up birds around a 5 mile radius take off... mind the end cap ( in silver ) is in the boot as I don't know how it all goes together any one know....??????

It looks like if I bolt it up it cuts of the exhaust gases???

Derek · Post by **Derek** » Mon May 31, 2004 10:11 am

I have only used them on bikes, but the end cap should be on. You also
add or remove the discs to tune the exhaust before installing the end cap.

912uk · Post by **912uk** » Mon May 31, 2004 11:48 am

but it still looks like you bolt up the end cap and it seams to cut off the exhaust gases. Is this right. ( it like putting your hand over the end and blocking it off) ???

Lightweight_911 · Post by **Lightweight_911** » Mon May 31, 2004 12:28 pm

The end cap should be (bolted) on.

The central pipe has lots of holes drilled in it - as you add discs between the end of the exhaust & the end cap it restricts the flow from the end of the pipe & forces the gases out of the radial holes

Remove discs to decrease the exhaust opening and increase back pressure.

This decreases the powerband to give you more low-end torque.

Add discs to increase the exhaust opening and reduce back pressure.

This increases the powerband to give you more top- end.

The fewer the discs, the quieter the system; the more discs, the nosier it becomes.

912uk · Post by **912uk** » Mon May 31, 2004 7:58 pm

no discs at the mo...

will look into it later