fishtail straights and torque
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1st Gear
Joined: Mar 2007
Posts: 5
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fishtail straights and torque
I have a 2015 heritage that I am going to be putting some Samson fishtail on. I am thinking the 33"s. my question is that if I get the straights with no baffles will it effect my torque on this 103 fuel injected motor? I have always been a carbureted guy running pans and knuckles , this is my first modern fuel injected bike. I have heard that the straight pipes really hurt the torque on these motors. right now I have python slip ons with baffles in them. still a little quitter than I am used to. I really have never used the torque cones . I don't even know if they work. I have run old fashioned lollipops . just wanted some input on this. right after the pipes I am getting a s&s breather and a v&h fuel pac.
Club Member
Joined: Jun 2007
Posts: 45,429
Likes: 2,898
From: Bedford UK
Separate pipes can hurt torque, which is why all Harleys (and indeed all brands of multi-cylinder bikes) for a long time have some sort of balance pipe or siamese system, which improves low/mid range torque. If you retain your stock headers and fit fishtails you shouldn't suffer too much IMHO. If you don't have a tuner I would certainly consider getting one and having your bike set up on a dyno. Talk to your dyno shop about what they recommend.
Tourer
Joined: Dec 2009
Posts: 399
Likes: 25
From: Northern Alberta
I imagine you are putting on a true dual setup? Probably sound amazing and perform otherwise. The stock head pipe on the Heritage has an interconnect that lends itself to good potential for power if you decide on a quality slip on instead.
Road Captain
Joined: Jun 2010
Posts: 533
Likes: 57
From: Fredericksburg, VA
True dual or 2 into 1, no baffles will hurt torque on a street bike size engine.
I ran a 2 into 1 with a straight fishtail on my old Shovel. I added a short (4", maybe? something like these) baffle and it kept the volume good, but added enough back pressure to make the bike run like a raped ape.
I ran a 2 into 1 with a straight fishtail on my old Shovel. I added a short (4", maybe? something like these) baffle and it kept the volume good, but added enough back pressure to make the bike run like a raped ape.
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