Kawasaki KRX Intake Comparison: UTV Forge vs Factory FrogzSkin vs S&B

Quick verdict: For most Kawasaki KRX 1000 and KRX4 owners who want a practical intake upgrade for both the engine and CVT, the UTV Forge KRX High-Flow Intake Kit is the strongest all-around value. It replaces the factory FrogzSkin-style inlet covers with two serviceable 4-inch filter locations, installs on the original hoses without cutting, and costs substantially less than the engine-only S&B Particle Separator.

That does not make every alternative bad. The factory FrogzSkin vents are simple, hydrophobic, and already paid for. The S&B system is a well-engineered premium pre-separator for riders who spend long days in extreme dust. The right choice depends on whether you prioritize cost, engine-only dust ejection, CVT coverage, service access, wiring simplicity, or water resistance.

Disclosure: UTV Forge manufactures and sells the UTV Forge intake kit reviewed here. Prices and specifications were checked in November 2026; verify current fitment and pricing on each manufacturer’s page.

KRX intake comparison at a glance

1. Original KRX FrogzSkin intakes: simple and useful, but limited

The original KRX inlet covers use a FrogzSkin-style hydrophobic mesh. FrogzSkin describes its product as a peel-and-stick mesh that allows airflow while decreasing the amount of water, dirt, snow, and debris entering a ventilation system. The manufacturer also says clearly that the material is not waterproof.

Pros of the factory FrogzSkin setup

• Already on the machine: no purchase, wiring, brackets, or added maintenance parts.
• Hydrophobic surface: helpful against normal spray, rain, snow, and larger trail debris.
• Low weight and no moving parts: there is nothing electrical to fail.
• Retains the stock appearance: useful for owners who want to leave the KRX untouched.

Cons of the factory FrogzSkin setup

• It is mesh, not a pleated serviceable air filter: it reduces contamination at the opening, but it is not equivalent to a clamp-on filter designed to collect a broad particle range.
• Small exposed surface area: dust, mud, or water loading can reduce available airflow until the mesh is cleaned.
• Adhesive and impact vulnerability: repeated cleaning, branches, cargo, pressure washing, and age can damage the mesh or its bond.
• Maintenance access is less convenient: there is no filter element to remove, wash, inspect from both sides, and reinstall.

The stock setup is reasonable for light use. Its weakness appears when a KRX repeatedly follows other machines in dust, works in mud, or needs frequent access for cleaning. That is where converting the openings to serviceable filters becomes attractive.

2. UTV Forge KRX intake kit: the best balance for most owners

The UTV Forge system replaces both factory inlet locations with compact chambers that accept 4-inch flange clamp-on filters. One chamber serves the engine intake and the other serves the CVT intake. The kit uses the original hoses, requires no cutting, and keeps the factory engine filter in place as the final protection stage.

Pros of the UTV Forge kit

• Engine and CVT coverage: this is the biggest practical advantage over the S&B KRX separator. You get a serviceable filter location for both systems in one kit.
• Better available airflow when maintained properly: the large 4-inch filter area is designed to let the engine and CVT breathe. Like every filter system, airflow depends on keeping the media clean and correctly installed.
• Real filter media: a compatible pleated or foam clamp-on filter captures particles in media rather than relying only on hydrophobic mesh or centrifugal separation.
• No-cut installation: the chambers clamp into the original hoses, so the machine can be upgraded without cutting the body or factory plumbing.
• Easy inspection and cleaning: remove the filter, inspect it, clean or replace it according to its manufacturer’s instructions, and reinstall it.
• Passive and compact: no fan, wiring, power draw, or large roll-bar-mounted housing.
• Filter choice: the kit accepts compatible 4-inch flange filters. The kit-only option lets owners choose dry, oiled, foam, or other media they already trust.
• Cost: even the complete two-filter package is well below the current S&B price.

Cons and maintenance realities

• Filters need service: a loaded filter becomes restrictive. Inspect more often when riding in convoys, silt, mud, or heavy dust.
• The base kit does not include filters: select the complete bundle or purchase two compatible 4-inch filters separately.
• No honest fixed temperature promise: clean CVT intake media helps preserve cooling airflow, but belt temperature also depends heavily on riding style, terrain, tire size, clutch calibration, vehicle load, belt condition, and ambient temperature.
• It cannot stop internally generated belt dust: the CVT filter reduces outside contamination entering the cooling path; the belt and clutches still create their own dust.
• Not a snorkel: the system is intended for dust, mud, rain, and normal trail splashes, not full submersion.

3. S&B KRX Particle Separator: excellent technology, different job

The S&B Particle Separator is a premium powered pre-cleaner for the KRX engine intake. Its vortex tubes separate dust from the airstream, and an automatic scavenge fan ejects that dust before the remaining air reaches the stock engine filter. S&B says the unit separates more than 94% of dust before the factory filter.

That 94% figure describes pre-separation, not final filtration efficiency. The stock engine filter remains in the system and catches what passes through. This is why particle separators and filters should not be treated as identical devices.

Pros of the S&B system

• Strong dust-load reduction: removing much of the airborne dust before it reaches the stock filter can extend service intervals in extreme conditions.
• Automatic operation: the variable-speed scavenge fan runs as needed.
• Water, snow, sand, and dust focus: S&B designed the unit for harsh off-road environments.
• Retains the factory final filter: the separator is an added stage, not a deletion of the stock engine filter.
• Premium fit-specific package: it includes purpose-built mounting and ducting for the KRX.

Cons of the S&B system

• Engine only: it does not add filtration to the CVT intake. Owners still need a separate CVT solution.
• Higher price: the current $499 price is nearly twice the UTV Forge complete two-filter bundle.
• More installation complexity: it occupies roll-bar space and requires duct routing plus a pulse-busbar electrical connection.
• More components: fan, wiring, housing, and ducting add size and failure points compared with a passive filter conversion.
• The factory engine filter still requires inspection: service intervals may be longer, but the final filter does not disappear.

Does a real filter provide better filtration than the S&B separator?

As a component, yes: a real air filter is the filtration stage, while a particle separator is a pre-cleaning stage. A separator ejects a percentage of incoming contamination; it does not replace the stock final filter. A clamp-on filter captures particles in its media before air continues downstream.

For example, the optional K&N RU-3119HBK Dryflow filter fits a 4-inch flange, and K&N publishes an overall efficiency rating of up to 99% for that specific filter. K&N also explains that ISO 5011 results are comparable only when test dust, airflow, terminal restriction, and other variables are held constant.

That means it would be misleading to compare “up to 99%” directly with S&B’s “over 94%” and declare a laboratory winner. They measure different stages under different disclosed conditions. It would also be wrong to apply the K&N number to every compatible filter or to the SPE filters in the UTV Forge bundle without a matching test report.

The defensible real-world advantage is simpler: UTV Forge lets you add chosen filter media at both the engine and CVT openings, while S&B pre-separates dust only for the engine and relies on the stock engine filter for final filtration.

Which KRX intake keeps the CVT cleaner and cooler?

Of these three choices, UTV Forge is the only aftermarket kit in this comparison that directly converts the KRX CVT intake to a removable serviceable filter. That helps reduce outside trail dust, sand, leaves, and mud entering the CVT cooling-air path.

A clean, properly sized filter also preserves available cooling airflow better than a small opening that is packed with debris. But no intake kit controls every source of CVT heat. Aggressive low-speed throttle, oversized tires, steep climbs, deep mud, clutch setup, belt wear, machine load, and ambient temperature can have a much larger effect. The honest promise is cleaner incoming air and strong airflow when maintained properly, not a guaranteed temperature reduction.

Rain, mud, and water: what should KRX owners expect?

• Factory FrogzSkin: hydrophobic and helpful against spray, but FrogzSkin says it is not waterproof.
• UTV Forge: suitable for normal rain, mud, and trail splashes with the correct filter and regular maintenance. Optional pre-filter wraps can be useful in extreme dust or wet debris. It is not designed for full submersion.
• S&B: designed to pre-separate water, snow, sand, and fine dust for the engine intake, but it does not address the CVT opening.

Which Kawasaki KRX intake upgrade should you buy?

Keep the original FrogzSkin vents if:

• You ride mainly in mild conditions.
• Your factory mesh remains undamaged and easy to keep clean.
• You want to spend nothing and retain a completely stock machine.

Choose the S&B Particle Separator if:

• Your top priority is reducing dust load ahead of the stock engine filter during sustained extreme-dust riding.
• You are comfortable with the $499 price, roll-bar installation, and wiring.
• You already have a separate plan for the CVT intake.

Choose the UTV Forge KRX intake kit if:

• You want one upgrade for both the engine and CVT intake paths.
• You prefer real, removable filter media and easy service access.
• You want no cutting, no wiring, and a compact installation.
• You want strong airflow with properly maintained filters.
• You want the most complete value in this three-way comparison.

The no-brainer answer for most KRX owners

The factory FrogzSkin mesh is inexpensive and simple. The S&B separator is impressive premium technology for the engine. But for the typical KRX owner asking for easier maintenance, cleaner incoming air, better breathing when the system is kept clean, and direct CVT coverage, the UTV Forge kit checks more boxes for less money.

It is not magic and it is not maintenance-free. It is a straightforward, no-cut way to put serviceable air-filter media where the KRX needs it—at both intake openings—while retaining the factory engine filter as the final stage.

See the UTV Forge KRX Engine & CVT Intake Kit

Frequently asked questions

Does the UTV Forge kit replace the factory engine air filter?

No. The external engine filter acts as a serviceable first stage, while the original engine filter remains in place.

Are filters included?

Only with the complete filter bundle. The kit-only option includes the engine and CVT chambers without filters.

Will it lower CVT temperature?

It can help maintain cooling airflow by replacing the factory opening with a large serviceable filter area, provided the filter is kept clean. Actual temperature depends on riding style, terrain, tire size, clutching, belt condition, load, and weather.

Does it eliminate CVT belt dust?

No. It reduces outside contamination entering the CVT cooling path, but it cannot prevent dust created internally by the belt and clutches.

Is it waterproof?

No intake in this comparison should be treated as a full-submersion snorkel. Use appropriate filters or wraps for your conditions, inspect after wet or muddy rides, and follow the filter manufacturer’s service instructions.

Sources and specifications

• UTV Forge KRX High-Flow Intake Kit product page
• S&B KRX Particle Separator specifications
• FrogzSkin FAQ: hydrophobic mesh and water limitation
• K&N RU-3119HBK filter specifications
• K&N explanation of ISO 5011 efficiency testing