Plug off crossover w/ decatted header
Road Master
Joined: Feb 2014
Posts: 804
Likes: 237
From: TN
Dragos Bike Works also has a 2:1 / 2:1:2 single header option. They recommend their race muffler option for best performance. I imagine that the right baffle would be crucial to getting it right. As a side note, Sheffer Performance tuned a 128 with a stock decatted headpipe and still made around 140 hp, I’m sure there was some left on the table but…….
4th Gear
Joined: Mar 2025
Posts: 8
Likes: 0
From: New Jersey
Been thinking of this for a while. I run stock mufflers, stock air cleaner from a '19 sport glide, and a decatted head pipe with no tuner. The bike run great; the plugs are fine, a solid 46.5 MPG (on the two lanes), and no pinging/knocking/ or backfiring. I used a 1 5/8" freeze plug ( that I left in the freezer over night) and it tapped in easily; I did have to use an expansion tool for the cross over pipe to make it easier to put back on (I do this any time I pull an exhaust apart, just goes back together easier) . And then tightened the clamp. Took it for a 20 mile ride and the butt dyno feels like a tad bit more jump at the hit of the throttle but very rideable and the exhaust note seems about the same. I'll go for a longer ride in a few days (damn house still hasn't learned how to remodel itself) and check the plugs & mileage, and such. But so far so good.
Stellar HDF Member
Joined: Mar 2020
Posts: 2,235
Likes: 2,157
From: West Coast
unsolicited advice... Before you pound the plug in the pipe, put a bolt into the end of the cap with some left extended out to where you can grip it should you change you mind. You can use the exposed bolt to pull that bitch back out, else its permanent.
HDF Community Team
Joined: Mar 2017
Posts: 7,837
Likes: 4,405
From: Texas
solid advice
HDF Community Team
Joined: Mar 2017
Posts: 7,837
Likes: 4,405
From: Texas
4th Gear
Joined: Mar 2025
Posts: 8
Likes: 0
From: New Jersey
https://www.harborfreight.com/slide-...ece-56894.html
would that not work?
is it that bad of a mod that I will want to undo this later? Lol what's the downside? Lol
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post
johnnyshrooms
General Harley Davidson Chat
0
Sep 13, 2008 07:53 AM
04ctd
Exhaust System Topics
4
Aug 13, 2008 10:13 AM