Back Pressure
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Stage I
Joined: Oct 2011
Posts: 1
Likes: 0
From: Texas
Back Pressure
need help i have a 1986 sportster 1200 straight pipes need to know about back pressure was told to drill 1/4 inch hole in pipe and put nut and bolt on it and it would give me the right back pressure plesase give advice
Road Master
Joined: Jul 2007
Posts: 765
Likes: 1
From: Maryland
Anything that restricts the flow of air through the exhaust will create more back pressure. I have heard of guys tuning their exhaust perfectly using this method.
There might already be holes in them. Check the under side/bike side near the end of the pipes. Mine have holes from the original baffles.
There might already be holes in them. Check the under side/bike side near the end of the pipes. Mine have holes from the original baffles.
Road Captain
Joined: Aug 2011
Posts: 693
Likes: 67
From: LI, NY
Road Captain
Joined: Aug 2011
Posts: 693
Likes: 67
From: LI, NY
Road Master
Joined: Sep 2010
Posts: 1,056
Likes: 0
From: Cottage Grove MN
What I have done for friends is weld a 1/2" washer or smaller to the end of a 1/4-20 bolt, put through the pipe tighten the nuts and off you go. It will still be loud but give you some much needed back pressure .
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