Which part number is the shorter velocity stack?
14073 or 14073A
I’m guessing that it is 14073….just wanted confirmation before ordering them.

Thanks

* Last updated by: siroht on 10/20/2024 @ 8:22 AM *

Answering my own question and providing a trail in case someone searches for this at some point in the future. The short stack is indeed part #14073.

Ordered them last week and they arrived today. Install took approximately 1 hour including removing and reassembling fairings. Seat of the pants indicates that the 4 short OEM stacks definitely provided some additional fire in the upper RPM range. When I quickly chop the throttle from 4,000 RPM the front wheel comes up with ease, where before it didn't do this, especially with my weight 250 lbs. Also there's a slight change when I'm cruising at 3500-5000 RPM, and when I roll into the throttle. The effect is like when you ride your bike with a restrictive OEM exhaust system and then you fit a full exhaust system. For the lack of a better term, It seems that the bike breathes better and is in a more relax state(torque loss)at that RPM range. Without a dyno, I'm assuming that this is trade off from running 4 short stacks, opposed to 2 short/2 long stacks. Since I'm a adrenaline junkie and prefer top end performance over the low/midrange area which is still very impressive, I think I'll be sticking with the 4 short stack setup for the foreseeable future.

I did perform some top end pulls to see if my AFR would be affected, and when I returned home and analyzed my logs my AFR's didn't change so it appears that the new stack setup did not affect my top end AFR.

Oh, when I returned home from my test ride, my WW ceramic wheel bearings were sitting at my front door. I wasn't expecting them until Friday. I'll be tackling the install tomorrow morning.

Thanks for the update. There's going to be some mods going into my Gen2 soon too. I don't know how far I'll go with an NA setup. I'm thinking about turbo in the future and I'd have to undo a lot of them....velocity stacks for sure. I would try if it's not too expensive. I will get a pipe because I can't see riding with the stock exhaust for a year or more before going turbo.

I plan to either turbo my current 14R or move to a H2. At my age, 55, time is limited.

The OEM short stacks cost $30 each compared to FP’s $400+ price tag. It was a no brainer for me.