Loud pipes

**scumdog** · 19th December 2007, 08:18

I had the ends of my H-D mufflers whacked off where they taper down (at the outlet end!) and some nice stainless end caps fitted, - all the fibreglass and mesh guts were ripped out which cut the weight in half - at least!

So now they are just hollow cans with a cap which is held in place with button-headed 6mm Allen bolts (just in case I had to re-baffle them if I felt they're too loud) but as it turned out they are not too loud. (Ask anybody who was at the KB Staging Post rally.

And the best part is they look 'factory'.

**Omega1** · 19th December 2007, 10:01

I have a Screamin Eagle Supertrapp 2 into 1 on mine, I currently run it with a open end cap which is pretty loud however if things get tough with the Reg's then I'll just add the original closed end cap and a couple more discs to quieten it down.

**skidz** · 19th December 2007, 12:30

Keep with the noise. There's that old safety thing about being heard before seen.

**vifferman** · 19th December 2007, 12:45

Originally Posted by skidz

Keep with the noise. There's that old safety thing about being heard before seen.

That's right!
Fuck everyone else - make sure you're noticed!

**xwhatsit** · 19th December 2007, 13:09

I was splitting up the Southern (?) Motorway behind Magua on Monday, who rides a CB400N with silencers wot lack quite a bit of baffleage. Cars practically changed lanes in their efforts to make room for us. I need a pair of those ones, Mister!

**Ixion** · 19th December 2007, 13:23

I thought his bike was quite quiet. What you need is a Dunstall mega.

I suspect they made way because they thought he was Santa.

**vifferman** · 19th December 2007, 13:25

Originally Posted by Ixion

I suspect they made way because they thought he was Santa.

Loud farty noises?

**Ixion** · 19th December 2007, 13:26

Red. Bright red.

**xwhatsit** · 19th December 2007, 19:46

Originally Posted by Ixion

I thought his bike was quite quiet. What you need is a Dunstall mega.

I suspect they made way because they thought he was Santa.

Don't make fun of his bike, just because the Wetdreams are as heavy as a sleigh (and rattle as much as the sleighbells).

I picked up a CB250RS wreck off Twinkle, massive internal damage (piston skirt, cracked bore... woot woot). It had a pair of downpipes and Dunstall Decibel copies on it. Fitted them up to my bike, still really quiet lol -- it whirs and thrums now, instead of bafflerattling. It's got removeable baffles but I can't work out how to get them out (took the three bolts off, it still won't budge).

They're all ugly and shitty, and I want a 2-into-1 to save weight, so my quest remains.

**AllanB** · 19th December 2007, 21:08

I made some inserts for one of my bikes mufflers very easily. Can not find the bloody image though!.
I got a bit of off-cut muffler pipe from a muffler supplier (Magoo etc) that fitted inside the existing muffler pipe. I then hack-sawed a number of partial cuts in the pipe, one top one bottom then the next pair 180 degrees from the first and so on. Then I got a cold chisel and gave the leading edge of each cut a good whack indenting it. Continue for all cuts.
Insert the completed unit into the loud muffler, weld or bolt it in. About a 200mm length shut it up a lot.

I've attached couple of images that show the general idea of the indents. The pipe is still a straight through but the indents disturb the flow thus shutting it up.

**The Pastor** · 19th December 2007, 21:47

Originally Posted by Ixion

I thought his bike was quite quiet. What you need is a Dunstall mega.

I suspect they made way because they thought he was Santa.

Originally Posted by Ixion

Red. Bright red.

Originally Posted by xerxesdaphat

Don't make fun of his bike, just because the Wetdreams are as heavy as a sleigh (and rattle as much as the sleighbells).

Gold pure gold!!!

We call him the flaming hemeroid.

**The Lone Rider** · 19th December 2007, 22:12

Originally Posted by AllanB

I've attached couple of images that show the general idea of the indents. The pipe is still a straight through but the indents disturb the flow thus shutting it up.

I have a set of those in one of my bikes, Custom Chrome 1 3/4" harley baffles. They don't "shut it up", but take some of the bite off the sound. It's a good compromise between loud pipes and brutal pipes.

To deaden them a fair bit, wrap the fibreglass stuff around the middle section. Just dont go sticking your nose in your pipes from then on

**Angusdog** · 20th December 2007, 05:51

Originally Posted by AllanB

Then I got a cold chisel and gave the leading edge of each cut a good whack indenting it. Continue for all cuts.
Insert the completed unit into the loud muffler, weld or bolt it in. About a 200mm length shut it up a lot.

That's what Wgtn M/Cs did for my M50, although just one 'flute' in it. The difference is amazing - gentle, inoffensive burble low down, then a nice bark when you open 'er up. Still won't pass the new noise tests, so unless I find a deaf tester, I'll be changing pipes four times a year (twice for each WoF).