2011 Street Glide OEM mufflers
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Joined: Aug 2012
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From: Cincinnati
2011 Street Glide OEM mufflers
Can these stock mufflers be drilled out to improve the sound like I did on my old Dyna? I haven't read where anyone has done this. Would it require a re-tune?
Thanks,
Mike
Thanks,
Mike
Outstanding HDF Member
Joined: Sep 2010
Posts: 2,357
Likes: 8
From: Pa
I have read a bunch of threads about people using a 1 3/4" hole saw on the exit side of the muffler. THis allow you to remove the baffle.
https://www.hdforums.com/forum/8618095-post16.html
https://www.hdforums.com/forum/8618095-post16.html
Last edited by pontiac69; Sep 3, 2012 at 07:27 PM.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
you will likely get a better result removing the cat from the header pipe- some riders report that the stock mufflers work well once the restriction the cat causes is removed.
as for drilling mufflers, in most cases this is attempted on the way to buying a performance muffler that works well all through teh rpm range.
drilling often removes all the "science" from the design of the pipe and may reduce performance.
the best one is the guy who tries drilling with the mufflers in place and screws up his headers with all the force he applies to the mufflers...and of course it is possible for metal fragments to be sucked back into the motor from the exhaust.
mike
Mike
as for drilling mufflers, in most cases this is attempted on the way to buying a performance muffler that works well all through teh rpm range.
drilling often removes all the "science" from the design of the pipe and may reduce performance.
the best one is the guy who tries drilling with the mufflers in place and screws up his headers with all the force he applies to the mufflers...and of course it is possible for metal fragments to be sucked back into the motor from the exhaust.
mike
Mike
Get you a set of these, not costly and sound real good.
http://www.ebay.com/itm/Exhaust-Slip...r#ht_867wt_685
http://www.ebay.com/itm/Exhaust-Slip...r#ht_867wt_685
Road Captain
Joined: Feb 2011
Posts: 672
Likes: 23
From: Umatilla, Fl
Having installes Jackpot duals with OEM mufflers I can say that the exhaust sound did change for the better. It still wasn't where I wanted it so I found some Jackpot 3.5's and love it now. Changing out the cat header is a must, with the upside being you eliminate a lot of heat.
Road Warrior
Joined: May 2009
Posts: 1,537
Likes: 4
From: The Great River Road, Wisconsin
My cat is still in tact, and it made a nice difference.
Before a couple hundred mile jaunt last weekend, I took my torches and opened up completely. Sounds better yet. I stayed away from the welded seam by about 3/8" so I have about a 2 1/2" opening. You can see into the muffler quite a ways when you are behind the bike, but she has a nice bark when on it and a descent rumble at idle. This all with the cat still in place.
And No, no retune necessary (allthough I had the PV from my last bike which I reliscensed to this one).
Road Warrior
Joined: Aug 2009
Posts: 1,889
Likes: 104
From: Mississippi
you will likely get a better result removing the cat from the header pipe- some riders report that the stock mufflers work well once the restriction the cat causes is removed.
as for drilling mufflers, in most cases this is attempted on the way to buying a performance muffler that works well all through teh rpm range.
drilling often removes all the "science" from the design of the pipe and may reduce performance.
the best one is the guy who tries drilling with the mufflers in place and screws up his headers with all the force he applies to the mufflers...and of course it is possible for metal fragments to be sucked back into the motor from the exhaust.
mike
Mike
as for drilling mufflers, in most cases this is attempted on the way to buying a performance muffler that works well all through teh rpm range.
drilling often removes all the "science" from the design of the pipe and may reduce performance.
the best one is the guy who tries drilling with the mufflers in place and screws up his headers with all the force he applies to the mufflers...and of course it is possible for metal fragments to be sucked back into the motor from the exhaust.
mike
Mike
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Outstanding HDF Member
Joined: Jan 2011
Posts: 2,590
Likes: 31
From: Western Illinois, land of bad roads, and corrupt politicians
Get you a set of these, not costly and sound real good.
http://www.ebay.com/itm/Exhaust-Slip...r#ht_867wt_685
http://www.ebay.com/itm/Exhaust-Slip...r#ht_867wt_685
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