S&S CYCLE SKU: T14-663049

S&S Cycle Manifolds — 2017-2021 Harley-Davidson

$214.95
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S&S Cycle high-flow intake manifold for 2017-2021 Harley-Davidson Milwaukee-Eight engines, cast from T6 heat-treated aluminum and CNC-machined to replace the restrictive stock plastic unit. Engineered for unrestricted airflow to support 3-5 hp gains without emissions tampering.

Features

  • T6 heat-treated cast aluminum construction
  • CNC machined for precision fit
  • Replaces restrictive stock plastic manifold
  • Includes new rubber seal
  • CARB EO# D-355-39 exempt from emissions regulations
  • Easy installation

Specifications

  • Brand: S&S Cycle
  • Manufacturer Part #: 160-0241A
  • Material: T6 heat-treated cast aluminum
  • Weight: 1.4 lb
  • Category: Headers & Manifolds

Fitment

Fits 2017-2021 Harley-Davidson Milwaukee-Eight models.

Frequently Asked Questions

Will this add horsepower?

Yes — S&S rates this manifold at 3-5 hp gain by reducing intake restriction compared to stock.

Do I need a tuner with this manifold?

A fuel tune is recommended to optimize the air-fuel ratio and realize full power gains, though the manifold alone will flow better than stock.

Is this street legal?

Yes — it carries CARB EO# D-355-39 exemption, meaning it is not considered emissions tampering and is street-legal.

What's included in the box?

The manifold assembly and a new rubber seal for installation.

Will this fit my 2022+ Harley M8?

No — this manifold is specific to 2017-2021 model years. Verify your year before ordering.

BRANDS&S Cycle
TYPEHeaders & Manifolds
SKUT14-663049
WEIGHT1.4 lb
Please contact us to confirm fitment for your specific motorcycle, or check the product title for compatibility notes.
CUSTOMER REVIEWS
4.84
51 RATINGS
5★ 45
4★ 5
3★ 0
2★ 1
1★ 0
✓ VERIFIED
Nov 9, 2021

10/10 would recommend

Nearing 40k miles on my 2018 Road Glide I was concerned with some of the issues the stock M8 was having. Conveniently this kit fixes everything that I was worried about and has the added bonus of 30HP and 10TQ. The 475 cam really woke up my 107" and you can feel the increase in acceleration power through all the gears but especially over 70MPH.<br />- Wiz IOMC <8> IOFFIO

— Gregory C
✓ VERIFIED
Nov 1, 2022

Overkill, just like I wanted

Great kit with just about everything you need. Plenty of online tutorials to make it quite simple. Took me about 6hrs from start to finish, and I did it all in my front yard

— Atreyu S
✓ VERIFIED
Nov 8, 2021

Great product, A+. Great sound and quality

The kit is amazing, great quality and all parts needed for the job. Easily the best upgrade I?ve done to my bike. It?s exactly what the M8 needs to make it sound good. Would absolutely recommend.

— Cory G
✓ VERIFIED
Oct 29, 2021

The 475 cam really woke up my M8! More power and better sound the hardest thing to do ended up being removing and installing the exhaust. I highly recommend this.

— Glenn W
✓ VERIFIED
Jul 27, 2023

A superb kit. All inclusive except… (and not a real show stopper), read on —

Mostly bought this kit for the oil pump to avoid any problems with potential sumping issues but the old Harley battle cry “as long as we’re in there…” ruled in my case. Saw no downside to the 475 cam and wasn’t disappointed. New cam, cam plate, new lifters and adj pushrods, of course, and no warm fuzzies with the plastic lifter sleeves (not incl in this kit), so those went as well. No dyno to share as I went with a canned tune from FuelMoto on a DynoJet PowerVision and am autotuning. Butt dyno says good gains in hp and tq. Glad I did it. My only mild negative is that it wasn’t blasting me in the face that I needed a HD brand o-ring/gasket for the oil pump that they, for proprietary reasons, could not include. It may have been mentioned somewhere but I don’t recall seeing it. Not a big deal and certainly no reason to go elsewhere for a kit. This most excellent kit, except for said gasket, was otherwise all inclusive and I can’t recommend it too highly. Good job S&S. 2019 FLHXSE 117, oil cooled

— William W
✓ VERIFIED
Mar 14, 2024

Was worth it to me

Traded mpg for the power and chop from this cam. M8 107 dyno'd at 110hp 122tq.<br />2017 stock header, cat delete, x-over capped to 2-1, neighbor hater, k&n 63-1138

— Travis G