What's the difference between a through hull and free flow jetski exha

FREE FLOW VS. THROUGH HULL

Changing your exhaust is one of the easiest ways to give your ski a new personality. Louder, cleaner, sportier; whatever vibe you are chasing, an exhaust upgrade makes it happen. Both through hull exhaust systems and free flow exhaust kits are popular options.

Both will transform the way your ski sounds and feels on the water. The difference comes down to how much noise you want to make and how bold you want to be.

What is a through hull exhaust?

A through hull exhaust exits through the side or rear of your ski’s hull above the waterline. It is known for its aggressive tone and eye-catching style. You will hear it before you see it, and everyone else will too.

Why riders love it:

Maximum sound; loud, throaty, and race inspired
Style statement; a custom look that screams performance
Instant presence; people will know you have arrived before you even pull up

Things to consider:

It is loud, so check your local waterway rules
Installation requires cutting into the hull; once it is in, there is no going back

What is a free flow exhaust?

A free flow exhaust replaces the restrictive stock resonator with a straight pipe, letting exhaust gases pass more freely. The outlet stays at the rear of the ski, keeping a clean factory-style appearance.

Why riders love it:

Deeper, louder sound and a noticeable improvement
Clean look; keeps the original styling
Quick and easy install with no hull cutting required, also simple to reverse if need be

Things to consider:

Will make your ski significantly louder so check out your local waterway rules

Sound comparison

If sound is what you are chasing, here is the quick take:

Through hull exhaust: Loud, aggressive, and cheeky. Perfect for riders who want attention and love that race-ready bark
Free flow exhaust: Can be dronier at cruising speed but at wide open throttle (WOT), sounds badass

Style and presence

Exhausts are as much about style as sound. They change the whole feel of your ski.

Through hull: Big statement, big sound, big energy. It says “this ski is built to stand out”
Free flow: Stealth - you won't be able to see it, but you will definitely hear it

(And if you really want your ski to stand out, check out our Sea-Doo Spark Rear Dual Exit Through Hull Exhaust; a unique twin-exit setup that looks as good as it sounds)

Which exhaust is right for you?

Choose through hull if you want to turn up the style, do not mind a bit of hull surgery, and enjoy being the loudest rider at the ramp
Choose free flow if you want to boost overall volume without major modifications

Shop jet ski exhaust systems at Worx Racing

Whether you are chasing the rowdy bark of a through hull or the sporty growl of a free flow, we have the kits, we have them in stock, and we ship worldwide.

👉 Explore our full range of jet ski exhaust upgrades

Give your ski the attitude it deserves.