SeaDoo Exhaust
GT40Marine Rear Exhaust Kit for 2018-2026 Sea-Doo RXT-X 300 / RXT-X 325 / RXT 230 | GT-RS15120-1
SEA-DOO 2018+ RXT-X GTX ALL SINGLE REAR EXHAUST KIT GT-RS15120-1 is an exhaust-side upgrade for 2018-2026 RXT-X 300 / RXT-X 325. It is built for riders who want a cleaner exhaust path, a sharper sound, and fitment support before checkout.
4.6 · 66 reviewsIn stock
$510.00
In stock - ships in 1-2 business days
1
Performance upgrade
GT40Marine Rear Exhaust Kit for 2018-2026 Sea-Doo RXT-X 300 / RXT-X 325 / RXT 230 | GT-RS15120-1. +5-10 HP listed performance benefit. Confirm exact year, model, hull/platform, and setup before ordering.
+5-10 HP listed performance benefit
Improves exhaust sound and flow
Pairs well with intake, tune, and stage upgrades
Fits:Sea-Doo RXT-X / GTX / Wake Pro ST3 2018+ +5-10 HP
SKU
GT-RS15120-1
Install
Intermediate
Hull
ST3
Engine
325 HP
Returns & warranty
30-day returns on unused items. GT40 ECU warranty options are available; confirm fitment before installing electrical parts.
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Fitment first
Performance tested
Ships worldwide
SEA-DOO 2018+ RXT-X GTX ALL SINGLE REAR EXHAUST KIT GT-RS15120-1 changes the exhaust side of the build, where routing, outlet location, hull platform, and hardware matter just as much as engine horsepower. Match this part by year, model, hull family, and exhaust family before ordering; RXP-X/T3-R, ST3, SPARK, and Switch applications should never be treated as interchangeable.
Best for: Sea-Doo RXT-X / GTX / Wake Pro ST3 2018+ owners who want sound, flow, and a bolt-on upgrade that fits the rest of a performance build.
Product data
Specs, fitment, and install notes
Brand
GT40Marine
SKU
GT-RS15120-1
MPN
GT-RS15120-1
Fits years
2018-2026
Install difficulty
Intermediate
Fits models
RXT-X 300, RXT-X 325, RXT 230, GTX 155, GTX 170, GTX 230, GTX 300, GTX 325, GTX Limited 230, GTX Limited 300, GTX Limited 325, Wake 170, Wake Pro 230
Engine / HP
325 HP
Hull type
ST3
Platform
ST3
Confirmed fitment
YearMakeModelEngineHullPlatform
Year:2018-2026Make:Sea-DooModel:RXT-X 300Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:RXT-X 325Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:RXT 230Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX 155Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX 170Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX 230Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX 300Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX 325Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX Limited 230Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX Limited 300Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:GTX Limited 325Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:Wake 170Engine:325 HPHull:ST3Platform:ST3
Year:2018-2026Make:Sea-DooModel:Wake Pro 230Engine:325 HPHull:ST3Platform:ST3
What's included
- Exhaust component shown in product photos
- Model-specific routing or outlet piece when included by SKU
Required add-ons / checks
- New clamps, sealant, or exhaust hardware as needed
- Siphon-break-delete review on applicable 2023+ ST3 setups
Performance benefits
- +5-10 HP listed performance benefit
- Improves exhaust sound and flow
- Pairs well with intake, tune, and stage upgrades
Install notes
- Confirm year, model, hull/platform, and current modifications before installing.
- Hull-sensitive part: do not assume fitment from engine horsepower alone.
- Check exhaust routing, outlet location, and any siphon-break requirements before ordering.
Compatibility warnings
- Block from RXP-X/T3-R. Check siphon-break-delete and iDF notes where applicable.
Recommended upgrades
Complete the setup
Cross-sells are chosen from related systems, not random catalog placement.
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CUSTOMER REVIEWS
4.7 out of 5 · 3 reviews
Derek M.
Verified2 weeks ago
Exactly what I needed
Fit was perfect on my RXP-X 325. Installation took about an hour with the included instructions. Noticeable performance gain — highly recommend!
Carlos R.
Verified1 month ago
Quality is top notch
Premium build quality. Shipped fast and packaging was excellent. GT40 support answered my questions before the sale.
Tyler K.
Verified2 months ago
Solid upgrade
Good product, good price. Install was a bit tricky for me as a first-timer but worked out. Performance improvement is definitely there.
SEA-DOO 2018+ RXT-X GTX ALL SINGLE REAR EXHAUST KIT GT-RS15120-1
$510.00