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Discussion Starter · #1 ·
Does anyone have any experience using these drop in baffles at the connection from head pipes to muffler?
Seems as though there is a need for back pressure with aftermarket exhausts as well.

606281


If anyone can chime in with some knowledge or experience that would be great.
This sizing would work with my application
 

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I was tempted by those to quiet a Bub7 2-1 but I thought to use them on the muffler exit not at the head pipe to muffler connection - might work but 60 MM seems small for a 2.5" pipe but using I.D might be OK they should be tight so measure pipe I.D. first then order - that honeycomb core must be quite restrictive but hey you never know till you try - at that price give 'em a shot are you intending on trying to use two on a stock V Rod 2-1-2 muffler exhaust ?
 

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Discussion Starter · #3 · (Edited)
This would be going into a custom danmoto pipe. The size seems right for my setup. But like you, I’ve been thinking of an end cap type baffle to quiet it down.
 

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All I can say is the REVO engine likes to have an open exhaust - short stroke & high Rpm require the exhaust to exit without too much restriction to take advantage of collector scavenging for the other cylinder. Yes, a bit of back pressure is needed maybe a couple PSI to retain torque but if it's snubbed down too much it'll steal high Rpm Hp - this is a balancing act - how short a pipe can your right ear stand and how much will you restrict it and reduce performance to kill the noise ? I've come to the overall conclusion ( at least for me ) that the exhaust / muffler needs to go to the rear axle in length - this way it kills the noise in the length of the pipe / muffler, not with restrictive back pressure put on a shorter race pipe - there is no free lunch with exhaust flow & noise abatement - just ask me - I've got a BMW M3 Car SS / Carbon resonator grafted onto my Bub7 2-1 pipe to take the right eardrum destructive noise outta the pipe - and it works ( just barely ) with a 4" O.D. and 3.5" I.D and I put in SS Wool packing in to replace the fiberglass crap that blew out in 250 miles - I've got a final reducer to weld on the exit to keep noise inside the pipe and that's it - I'm done for now - I only got like 80 man hours in this solution so far - (y) :geek:
 

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Discussion Starter · #6 · (Edited)
Likewise. I’d love to see the setup!
Great info btw.
Ideally, I’d like to have a removable baffle. That being said, the end cap based silencer I think will best suit my needs.
I do plan on dyno testing my exhaust setup, so I’ll have to do a couple runs with and without the baffle.
 

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No, I've never posted a photo of my exhaust setup - in fact I've never even posted a photo here, I'm a bit busy now at the airport during this new year 2021 kickoff but when I get time I'll take a pic and see if I'm smart enough to post it - (y) :LOL:
 
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