From our newsfeeds:

Finished the Fuel Moto 98" build on Adam's sweet 2000 Road King last week. We installed the the FM 98" kit with Wood TW-555-6R cams, FM Level B CNC heads, and dyno tuned it with Dynojet PC III. When we got the build assembled and tuned we found this to be an extreme example of how the exhaust system can/will affect the overall results. He was running Vance & Hines true duals with fishtail mufflers which simply would not support the Hp/Tq for this application. We installed a Kerker 2/1 system and picked up an additional 21Hp/10Tq over the true duals. We thank you for choosing Fuel Moto, you were a pleasure to work with.

 

So yeah, there's the proof. All 3 dyno runs, when I showed up, after the build but still with my true dual setup, and after the exhaust swap. There's no denying the results. And as worried as I was about losing the true dual sound, I shouldn't have been. It sounds better. How much of that is the motor being way more built and how much is the 2 into 1 exhaust, i can't really say. But it does sound better than it ever has.

 

I believe you have helped a lot here with this post overall. I know I am stoked for my build with them soon and when you heard Bob have those conversations over and over I was more than likely one of them! One of the main reasons this company is the way they are is the honesty and integrity it has with its customers and workmanship. Well appreciated among all of us. It is a needle in a haystack out there and Fuel Moto is the best.

 

So OP, aside from the 2 into 1, how much did the 98 kit improve things?

 

Thats awesome, happy for you. I love my thunderheader 2 into 1. I wish fuel moto was closer. i am in california and it is just too far for me to get to. I had thought about shipping my bike but its pricer. i would love some engine work, but there is just no one around here i trust with my engine build or the dyno to get it right.

 

When I got it there it was 64hp and 85tq. After the build with my duals it was 76hp and 102tq. After the 2 into 1 it was 97hp 112tq.

 

I also feel it worth mentioning, please don't misunderstand... This pipe did not add 20 horsepower in and of itself. The 2 into 1 brought out was was being killed by my old exhaust with this build that fuel moto did. The 2 into 1 helped that build that much. Don't go thinking you'll get 20 horsepower by adding a 2 into 1 to any motor. This in response to a forum member, who shall remain nameless, you sent me a private message telling me the pipe added more than the engine build did. I'm only saying anything publicly in case there are others who think that. It doesn't work that way. The exhaust was simply the final component to the build. Not independent of it.

 

Nice write up.

It's obvious that some forum members don't fully read a post, many don't fully understand the info in the post and many don't understand what factors make or kill performance.

I'll say if you want performance spec and buy a complete "system" of parts chosen to work together.

You can;t fight physics, multiple cylinders working together make better power then individual cylinders- there are advantages to a common intake over individual carbs, advantages to shared exhaust tracts whether a 2/1 or a 2/1/2
Thats why every v8 has the cylinder banks connected back by the tranny- free power.
the length and volume of the intake and exhaust will also greatly contribute to power curves- if the cam(s) and heads can take advantage of those characteristics.

the 2/1 on a HD is a classic look- all my Panheads were born with a 2/1, all my evos and TC's were born with a 2/1/2


Mike

 

Hey Fuel Moto...sounds like there is a franchise opportunity here!

I could see one in each major bike market.

 

I don't claim to be an expert in exhaust systems and engine performance and, apparently, I'm lacking in the reading comprehension department, but wasn't the overriding theme of the OP's original write up and subsequent posts that simply changing a 2-1-2 to a 2-1 exhaust substantially improved the performance numbers of the engine? I mean look at the before and after results; there was a 26% increase in torque and a 9% increase in horsepower. Even Fuel Moto's dyno charts on their website (http://www.fuelmotousa.com/p-33193-d....html#rushmore) indicate a 15% increase in torque and a 16% increase in HP just by replacing the stock exhaust with a Jackpot 2-into-1 on a 2015 103HO Rushmore Road Glide. The numbers are similar with other 2-1 exhausts (Rinehart, V&H, Supermeg, D&D). Am I missing something?