Slip-on sizes
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Road Master
Joined: Feb 2010
Posts: 905
Likes: 51
From: New Jersey
Slip-on sizes
What difference does the size of the muffler make? 3 vs 3.5 vs. 4 inch, etc...? My stock mufflers are 3 inches. Just want to make sure I understand before I pull the trigger on a new set of mufflers.
Last edited by slowrollin; Oct 30, 2022 at 04:34 PM.
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Road Master
Joined: Feb 2010
Posts: 905
Likes: 51
From: New Jersey
This is what I found.
"Exhaust backpressure can build up flow resistance and reduce pumping and creating more pressure on the piston if the pipe is too small. Similarly, a pipe thats too large will lower backpressure, and a lack of backpressure eventually decreases velocity."
I interpret that to mean my best best is to either keep the same diameter as stock or maybe go up 1/2 inch but not more than that. Stock seems to be 3 inches. Probably what I'll go with
"Exhaust backpressure can build up flow resistance and reduce pumping and creating more pressure on the piston if the pipe is too small. Similarly, a pipe thats too large will lower backpressure, and a lack of backpressure eventually decreases velocity."
I interpret that to mean my best best is to either keep the same diameter as stock or maybe go up 1/2 inch but not more than that. Stock seems to be 3 inches. Probably what I'll go with
Thread Starter
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Road Master
Joined: Feb 2010
Posts: 905
Likes: 51
From: New Jersey
This is what I found.
"Exhaust backpressure can build up flow resistance and reduce pumping and creating more pressure on the piston if the pipe is too small. Similarly, a pipe thats too large will lower backpressure, and a lack of backpressure eventually decreases velocity."
I interpret that to mean my best best is to either keep the same diameter as stock or maybe go up 1/2 inch but not more than that. Stock seems to be 3 inches. Probably what I'll go with.
Didn't post that originally because I thought maybe I asked a question everyone else already knew the answer to except me. Sorry.
"Exhaust backpressure can build up flow resistance and reduce pumping and creating more pressure on the piston if the pipe is too small. Similarly, a pipe thats too large will lower backpressure, and a lack of backpressure eventually decreases velocity."
I interpret that to mean my best best is to either keep the same diameter as stock or maybe go up 1/2 inch but not more than that. Stock seems to be 3 inches. Probably what I'll go with.
Didn't post that originally because I thought maybe I asked a question everyone else already knew the answer to except me. Sorry.
Club Member
Joined: Feb 2013
Posts: 9,833
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From: Edmonton, Alberta
Size of the muffler itself is not the only factor to consider. Baffle size/construction also influences sound and backpressure.
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Just wanted to see if you received an answer that would validate my experience...
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