The Screamin’ Eagle High-Flow system, part 64900828 in Satin Black, is our qualified 2-into-1 pick for a matching non-California Harley-Davidson Softail. It has a current manufacturer product page, explicit fit exclusions, a 49-state emissions claim and a factory instruction sheet covering federal noise and emissions standards. Those documents make it a useful starting point, but the exact motorcycle configuration still has to qualify.
This is a documentation-based buying comparison. We have not fitted these systems, measured their sound or run a dynamometer test. Only the Screamin’ Eagle system earns a purchase recommendation here; the alternatives below show where the evidence still falls short of a complete road-use recommendation.
Three systems considered
| System considered | What the documents establish | Buying verdict |
|---|---|---|
| Screamin’ Eagle High-Flow 64900828, Satin Black | Specified 2018–2024 Softail fit; California excluded; manufacturer federal noise and emissions warranty | Our pick only after the exact bike and compliant configuration are confirmed |
| S&S SuperStreet 2-1 | CARB K-010-43 covers listed 2018–2024 applications; it expressly makes no noise-law finding | Further exact-part and noise verification required before a road-use purchase |
| Vance & Hines Pro Pipe Softail | Manufacturer claims 49-state emissions compliance; California excluded | Federal-noise evidence remains unresolved in this comparison |
Screamin’ Eagle 64900828: our pick for a qualifying Softail
This is a complete two-into-one system that replaces the stock head pipe and mufflers, rather than a pair of slip-on mufflers. The selected part is 64900828 with a Satin Black finish. Choose it when you want that full-system layout and the manufacturer confirms the part is appropriate for your motorcycle.
The current product page lists 2018–2024 Softail models, excluding FXDRS, FLFB, FLFBS, FXBR and FXBRS. It expressly excludes California models. Do not turn that year range into a promise that every Softail, engine conversion or accessory combination fits.
A concrete fit-screening example is a non-California 2020 Softail Standard FXST with its Milwaukee-Eight 107 engine. Harley’s model specification identifies that engine, and the model falls within the exhaust page’s published family and year range. Have a dealer verify the VIN, current engine and emissions configuration, and required compliant calibration before ordering; this example is not approval of an arbitrary modified build.
The factory instruction sheet, J06800, states that the system meets applicable federal noise and emissions standards at sale. It also warns against modifications that make the motorcycle exceed federal noise standards and notes that state and local noise rules still matter. Keep the supplied system complete and maintained.
Check Screamin’ Eagle 64900828 and its current fitment. The linked instructions also cover stainless sibling 64900829, but we did not verify a working current purchase page for that finish.
What to include in the installed-cost quote
Ask for a quote covering the system, required gaskets, the manufacturer-required compliant ECM calibration and labor. J06800 specifies separately purchased oxygen-sensor and exhaust-port gaskets. A headline exhaust price alone is not the total cost of completing the job correctly.
Have the installer check the exact year and model service information, controls, luggage and existing modifications. Harley recommends dealer installation when the work or tools are beyond the owner’s capabilities. This guide does not provide calibration changes or instructions for removing emissions controls.
Why S&S SuperStreet is not an unconditional second pick
S&S has genuine emissions documentation. CARB’s K-010-43 order covers the SuperStreet 2-1 on the applications listed in its exhibit, including specified 2018–2024 Softails. That is stronger evidence than an unverified “fits Softail” sales title, but the exact part, engine family and model must match the order.
The same order explicitly says it makes no determination about other laws, including noise limits. We did not establish the necessary federal-noise evidence for an exact current retail system, and the manufacturer’s 50-state category showed no product listings when reviewed. It remains a candidate to investigate with S&S, not a verified ready-to-buy alternative in this guide.
Read the exact S&S CARB order and application exhibit before relying on a seller’s claimed exemption.
Why Pro Pipe also needs another check
Vance & Hines describes the Softail Pro Pipe as having a PCX catalyst and 49-state federal emissions compliance, with California excluded. Those facts establish its advertised emissions scope. They do not establish federal-noise compliance in the material reviewed here, so we are not presenting it as a fully verified road-use substitute.
Keep emissions and noise checks separate
The EPA’s tampering policy explains that the Clean Air Act prohibits tampering with emissions controls and products whose principal effect is to bypass or defeat them. A race-only label, a louder sound or a physical fit is not a reason to treat an incompatible system as road approved. Use the complete approved configuration for the exact motorcycle.
For California, check CARB’s exact exemption and the part’s identifying label. CARB says modified emission-related parts on pollution-controlled motorcycles generally need an exemption. This does not override Harley’s explicit California exclusion for 64900828.
Replacement motorcycle exhausts also have separate federal noise requirements. An emissions approval alone does not answer that question, and a local rule may add another limit. If the complete fit and compliance evidence cannot be established, keep the compliant original system while you verify a replacement.
Questions about Softail 2-into-1 exhausts
Is 64900828 the best choice for every Softail?
No. It is this guide’s qualified pick for a matching non-California application. The published model exclusions, year range and exact engine configuration are essential checks before purchase.
Can I use this Harley system on a California model?
The product page explicitly says it does not fit California models and is not compliant for sale or use there on pollution-controlled vehicles. Choose only a separately verified solution for the exact California application.
Is this just a muffler upgrade?
No. Harley describes 64900828 as a full two-into-one system replacing the original head pipe and mufflers. Include the installation requirements in the purchase decision.
Does the recommendation cover an older or newer Softail?
The current fit statement covers specified 2018–2024 models. It does not establish fit for an earlier Twin Cam or Evolution Softail, or a 2025–2026 model. Obtain exact current manufacturer confirmation rather than extending the range yourself.
How much louder or more powerful will it be?
This comparison establishes no measured sound, horsepower or torque gain. Choose on verified application and compliance first, and do not mistake promotional performance language for a test of your motorcycle.
