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Making the WB R4 Sound Chk at 100db or less

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Ok her is the Short Version. I am still working on the long and will post a link to it, so not to take up space.

Bottom line is do this mod and the R4 Wb Exhaust will settle in at 100 db or less 98 if you do me secret patch prio to the test..

Here is the Mod,

Cut Accross 4 holes and bend downward into the Baffle.Remeber the Bend must be so the Exhaust flow is flowing into the new arch, I have about 28 or 30 divits made, I would say more then 28 28 is the min..



View from Inside



Wrap one layer of stainless steel wool grade 1, I have 3 pieces of wool cut to size here, they overlap about 1 inch.





Wrap the packing one full wqrap, cutting away the excess, DO NOT OVER LAP butt the ends together, it needs to be loose inside.




Once you have all the packing in and around, rivit the end back on and try it out.

Here is one last addition

if you fail (You Wont) bring it back to the truck and add the following to the end .

The Secret to 98db


Shred a small peice 2 -3 layers of packing and place into the spark arrester cone, you should just see sunlite if you hold it against the sun. Hold it in place with a small wire mesh.

Ride real slow to the sound chk booth, then check.

Hey if it dont work for you then what the heck you still have to by a new pipe anyway.

This has worked on my sns 250 and me 426

I put the secret in prior to the first test at 98 then the second without at 100...

I will post better details In soon.. I have alot of pics and ifo to put in...If you want all the pics wait until Sunday Eve, its taking time to format

Good luck


Oh ya if you ruin the Baffle dont worry you can get one for WB at I think 10 bucks


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White Brothers has a quiet insert for the R4 pipe in their catalog for $38. Pro Circuit also has one for their T4 for $26 and I just picked one up and with a slight modification it went right into my DSP. It dropped the sound a lot (they say 5-6 db) it lost some top end power at high PRM but gained A TON of power in the midrange. I can't believe how much harder it hits in the midrange now than with the wide open exhaust. I guess that's why all the modern sportbikes use a butterfly that blocks off the exhaust at lower RPM.

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I lost no HP in any RPM, alot of peopel have complained and removed the quite core becouse of the power lose,

and I am well under 100db,

and it cost me 10 bucks for the packing..

[ July 20, 2002: Message edited by: E.G.O.**** ]

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