Best stage 2 setup? I really don't want to go with a screaming eagle set up.
1st Gear
Joined: Apr 2024
Posts: 5
Likes: 3
From: FL
Because what most people mean is anti reversion/reversion control.
Baffles, collectors, lolipops, dogballs, and other implements cause gas to be accelerated or soundwave return to be obstructed as to not dirty or interfere with the next charge.
Generally if you remove these things that "create back pressure," which they mean control exhaust reversion, your torque goes to **** and your bike's tune will run lean or become problematic causing performance issues.
M8 Engines prefer to have long pipes, with high velocity exhaust speeds to ensure that reversion does not become a problem.
Baffles, collectors, lolipops, dogballs, and other implements cause gas to be accelerated or soundwave return to be obstructed as to not dirty or interfere with the next charge.
Generally if you remove these things that "create back pressure," which they mean control exhaust reversion, your torque goes to **** and your bike's tune will run lean or become problematic causing performance issues.
M8 Engines prefer to have long pipes, with high velocity exhaust speeds to ensure that reversion does not become a problem.
Road Master
Joined: Nov 2022
Posts: 802
Likes: 394
From: Missouri
Road Master
Joined: Mar 2024
Posts: 1,156
Likes: 503
From: Colorado
I will have to respectfully disagree. Backpressure and anti reversion / reversion are completely different things. I note this only because new riders trying to find an upgrade exhaust may get confused by the terminology and there are still people out there stating that backpressure is good. A common example would be you take a new Harley that has cats and baffles in the mufflers. You remove the mufflers relieving backpressure but as FB said you low end torque go to sheit. That's not because you alleviated backpressure (which you did) but its because now you have some major reversion, poor scavenging and slower velocity. That's why in those type of situations lollypops or even better the DK thunder torque inserts work so well. The ultimate I imagine is to have an engineered exhaust system designed for your engine type that has great scavenging, velocity and no backpressure (an example might be Blow Performance Exhausts which have engineered stages into the pipes and are really short). At any rate im no expert but you can find this info in engineering papers from car builders as far back as Carol Shelby Smokey Yunic to Harley Builder Kevin Baxter. Gale Banks has a few great videos on back pressure as well. Didn't mean to go down the backpressure rabbit hole and thanks for the discussion.
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
I see $287.95 on my end. How'd you get a discount?
Club Member
Joined: Oct 2022
Posts: 651
Likes: 508
From: United Kingdom
Add to Cart then enter the discount code 25BIKEWEEK.
Coupon Code 25BIKEWEEK unlocks Instant Discounts site wide. (Excludes crate engines, Baker transmissions, and products covered by MAP pricing) Coupon is valid for retail customers only, not valid for dealer pricing
Coupon Code 25BIKEWEEK unlocks Instant Discounts site wide. (Excludes crate engines, Baker transmissions, and products covered by MAP pricing) Coupon is valid for retail customers only, not valid for dealer pricing
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Add to Cart then enter the discount code 25BIKEWEEK.
Coupon Code 25BIKEWEEK unlocks Instant Discounts site wide. (Excludes crate engines, Baker transmissions, and products covered by MAP pricing) Coupon is valid for retail customers only, not valid for dealer pricing
Coupon Code 25BIKEWEEK unlocks Instant Discounts site wide. (Excludes crate engines, Baker transmissions, and products covered by MAP pricing) Coupon is valid for retail customers only, not valid for dealer pricing
Knocked another $18 off the cam.
Last edited by Mattbastard; Mar 7, 2025 at 07:48 PM.
Road Master
Joined: Aug 2008
Posts: 1,157
Likes: 303
I appreciate everyone's input on this and true experiences plus a big shout out to Fuel Moto for their help and advice.
I have now made a decision - I have decided on the ZIPPER's Performance Red Shift RS-468
...Why?
The kit includes:
I have now made a decision - I have decided on the ZIPPER's Performance Red Shift RS-468
...Why?
- The RS-468 works/is compatible with the V&H PCX shortshots (This was important to me as I like the style and sound of the system. I really didnt want to change or buy another exhaust system). This was confirmed by Fuel Moto as being the best cam to suit my exhaust system.
- Looking at the Dyno Charts, the RS-468 appears to have a smoother, more progressive torque and power delivery.
My thoughts/gutting feeling is that the WM8-22XE, as good a cam as it is, is going to be too aggressive, from a torque perspective, for my riding style. - The RS-468 lends itself best to my riding style I tend to cruise around, shifting below 3,000rpm. It seems better suited for riding in traffic but having the extra torque and power in the low to mid-range will work well when cruising the back roads and overtaking on the highway.
The kit includes:
- Red Shift RS-468 Camshaft, #413-810;
- Cometic Full Gasket/O-ring Kit (including the Torrington-Koyo Inner cam bearing), #C10178-B168;
- Fuel Moto EZ Quick Install Pushrods, #FM-PR-EZ;
- S&S Cycle Precision Lifters, #330-0718
- Screamin' Eagle Pro High Volume Oil Pump & Cam Support Plate Kit, Part Number: 62400260 (Note: If you have a pre-June 2019 M8 with the old pump, this upgrade is highly recommended)
- Screamin' Eagle High-Capacity Clutch Kit - Milwaukee-Eight Engine, Part Number: 37000287
- Screamin' Eagle High-Flow Injector Kit M8 Engine (5.5 gm/s), Part Number: 27400040
- S&S Cycle Tappet Cuff Set, Part Number: 330-0655
- Vance & Hines PCX Shortshots
- Vance & Hines V02X Air Filter
- Screamin' Eagle Extreme-Flow 55mm Intake Manifold, Part Number: 27300167
- S&S Cycle Billet Fuel Rail Kit, SKU:160-0287
- Screamin' Eagle Spark Plugs
- DK Customs 409 Pro Race Spark Plug Wires
- Twin Power Coil
- Dynojet Power Vision
will be watching for your opinion when your build is complete.
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
Tourer
Joined: Sep 2014
Posts: 279
Likes: 315
From: Southern Vancouver Island
I installed the exact same RS468 cam kit from Fuel Moto in my 107 M8 Road King this past winter.
Probably the only other bolt in cam I would consider would be the 22XE for my riding style but I loved the RS468 cam in my previous 107 Ultra so I went with another one in my Road King. Lots of guys out there are chasing big horsepower numbers but typically those style cams end up losing bottom end torque which is no bueno on a big Harley motor.
I think you will be happy with your choice!
Probably the only other bolt in cam I would consider would be the 22XE for my riding style but I loved the RS468 cam in my previous 107 Ultra so I went with another one in my Road King. Lots of guys out there are chasing big horsepower numbers but typically those style cams end up losing bottom end torque which is no bueno on a big Harley motor.
I think you will be happy with your choice!
Thread
Thread Starter
Forum
Replies
Last Post
Down South
Tri Glide, RG3 & Freewheeler Models
49
Jul 12, 2024 09:14 PM
I Wannabe a Biker
Ignition/Tuner/ECM/Fuel Injection
6
Apr 24, 2024 04:58 AM
Evo-Wes
Ignition/Tuner/ECM/Fuel Injection
9
Mar 19, 2023 04:15 PM