I went for a short ride around the block to test it out just straight, I was too curious.  It wasn't as obnoxious as I thought once I got it out of the garage (as one would expect).  It definitely popped everytime I let up on the throttle though.  But I loved it.  Don't worry my neighbors are acres away, I love in th emiddle of nowhere.

The fiberglass takes out the higher sounds and will make the sound lower,I've used it and put new in at about 2000 miles.

Would you stuff the steel wool just all up in the pipe from the open end?  Does it need an open airway down the middle like a baffle or can you just fill the pipe with it?

Also did you put that washer on the end closest to the header or the open end?( I was considering doing that I had read it suggested somewhere else on here.

Gyrobob wrote on 08/06/11 at 20:20:40:


Would you stuff the Scotch Brite Stainless Steel scrubbing pad just all up in the pipe from the open end?  Does it need an open airway down the middle like a baffle or can you just fill the pipe with it?

MrBrownTX wrote on 08/06/11 at 20:24:38:


You'd use the stainless steel to replace the fiberglass.  It would go around the outside of the baffle before you stuffed the baffle into the pipe.  That drag pipe baffle you showed from Amazon is supposed to have the fiberglass wrapped around the outside of the baffle.  The idea is to make a cheapo partially effective glasspack muffler out of it, except you would not use the fiberglass as the packing, you'd use the stainless steel scrubber stuff.

I ran to lowes this morning and bought a big 1.75" washer with a penny sized hole in the middle.  I hammered that down in the pipe pretty close to the header.  That made an enormous difference.  It seems pretty well muffled enough for me like this.  It runs pretty smooth now too.  

I forgot to stop for stainless steel scrubbing material but I don't think I am going to need it actually.  I need to go for a little ride and see how it sounds on the road but I would bet this is going to work for me.

MrBrownTX wrote on 08/07/11 at 12:50:01:


By blocking off the exhaust with the washer, you are cutting way way down on the max flow rate of the pipe.  It's like clamping your hand over the mouth of a screaming woman,.... she won't make nearly as much noise through her nose, but she can't breath very well either unless she is nearly at rest.

The straight pipe has a cross sectional area of 2.4 sq in.  If the washer you got has a 1/2" hole in it, the new cross sectional area is 0.2 sq in.  ALL the exhaust has to pass through that hole!  IOW, the new hole has less than one tenth the area of the exhaust pipe.  No wonder the thing has less power  

Here are some ideas:
 -- Drill a lot of 1/4" holes in the washer (about 12) and see what that does.
 -- Widen the hole in the washer to about 1.25"
 -- Get two more washers, widen the holes to about 1.25" and stick them in the pipe, spaced 6" and 8" apart
 -- Take out the washer, stick in the baffle about half way up the pipe
 -- Take out the washer, wrap the baffle in something that resists heat, and stick it about half way up the pipe
 -- Cut off some of the pipe, and weld on a shorty muffler