Too much exhaust flow?
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Joined: Feb 2012
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From: boston
Too much exhaust flow?
Hey guys i recently chopped up my 07' electra glide stock header pipe. I cut off the Y piece of back cylinder, capped and welded, and voila a nice clean home made 2-1 headpipe. Noticed a big tourque increase with sampson slip on i had on. My issue now is that i picked up a thunderheader slip on, put it on, and its WAY louder than my thunderheader on my 2010 fatboy. All i can think is that stock pipe diameter is larger than thunderheader head pipes. Is their anything i can do to maybe choke down pipe diameter?
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Joined: Jun 2007
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From: Bedford UK
Harley headers from all brands are the same stock diameter, with only a few exceptions. Your problem is that both cylinders are exhausting through a muffler intended for only one (and a bit!). You probably need a larger capacity muffler that can better deal with the exhaust from both cylinders.
If you look at aftermarket 2-into-1 systems, like my SuperTrapp, the pipes are stock diameter, but where they join together at the 'collector' that diameter is much larger. With your 'collector' being so small it is accelerating the gasses into the muffler.
If you look at aftermarket 2-into-1 systems, like my SuperTrapp, the pipes are stock diameter, but where they join together at the 'collector' that diameter is much larger. With your 'collector' being so small it is accelerating the gasses into the muffler.
Thread Starter
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Joined: Feb 2012
Posts: 94
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From: boston
Harley headers from all brands are the same stock diameter, with only a few exceptions. Your problem is that both cylinders are exhausting through a muffler intended for only one (and a bit!). You probably need a larger capacity muffler that can better deal with the exhaust from both cylinders.
If you look at aftermarket 2-into-1 systems, like my SuperTrapp, the pipes are stock diameter, but where they join together at the 'collector' that diameter is much larger. With your 'collector' being so small it is accelerating the gasses into the muffler.
If you look at aftermarket 2-into-1 systems, like my SuperTrapp, the pipes are stock diameter, but where they join together at the 'collector' that diameter is much larger. With your 'collector' being so small it is accelerating the gasses into the muffler.
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Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Casting my mind way back, some Harley models had a similar system to yours, they didn't have a large collector like mine, but they were also much lower performance. The brand name of your muffler tells us all - the darned thing is intended to make a lot of noise! If they make a baffle intended to reduce noise that might help. I don't see that putting anything in the pipe will help, but a larger capacity muffler might. Or a proper 2-into-1 of course......
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Mr Bentwrench
Dyna Glide Models
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May 15, 2015 07:29 AM
