Fi Exhaust 2021-2025 Porsche 992.1 GT3 / GT3 RS Valvetronic Muffler Catback Exhaust
T304 valvetronic catback for the 992.1 GT3 and GT3 RS. 5 tip finishes from $4,800. 25% lighter than OEM muffler section. Street to race tone on the factory Sport button. Bolt-on, no tune. Built to order at Fi Taiwan, 4-8 wks.
⚠ Lead Time & Order Terms
Required Reading
Fi EXHAUST components are bespoke production items — manufactured on demand specifically for your order. Materials are allocated and manufacturing begins as soon as your order is placed. The order cannot be cancelled, refunded, or returned for any reason including change of mind, longer-than-expected lead time, fitment compatibility (verify before ordering), shipping delays, or any other reason. By purchasing this product, you acknowledge and agree to these terms and to FFP’s full Terms & Conditions.
Before You Order
Why is the lead time so long?
Fi EXHAUST is not a stocked product line. Every catback, downpipe, and header pair is hand-built at Fi’s Taiwan facility when ordered — T304 stainless mandrel-bent, TIG welded, valvetronic actuators fitted, tip finish applied, then bench-tested before shipping. The 4–8 week window covers production + air freight from Taiwan to FFP’s Thousand Oaks shop, then to you.
Why no refunds or cancellations?
Because Fi allocates raw materials and starts production within hours of order receipt. Materials are cut, bent, and welded to your exact spec (tip color, configuration). There is no resale market for a half-built bespoke exhaust. This is the same model every premium exhaust maker (Akrapovič, iPE, Capristo, ARMYTRIX) uses for made-to-order systems. We’re straight with you about it up front.
How do I know it will fit my car?
Message us BEFORE you order. Send VIN, trim package, and any modifications (downpipe, headers, sport cats, OPF delete). We verify against Fi’s fitment database and confirm before you commit. Once the order is placed, fitment confirmation is your responsibility — we cannot accept returns for fitment issues that pre-order verification would have caught.
Will this trigger a CEL (Check Engine Light)?
Depends on the product. Valvetronic muffler catbacks generally retain factory cats/OPF and do not trigger a CEL. Catless downpipes / headers / Race Version full systems remove emissions hardware and will trigger a CEL unless paired with a tune or O2 simulator. Each product page calls out CEL risk in the fitment section — read carefully or ask us.
Do I need to tune my car?
Catback-only installs (this product type) do not require a tune — valves run off the factory exhaust control signal. Catless / Race Version installs typically require tuning or a CEL fix. We coordinate tuning through our trusted partners (Cobb, EMS, MHD, etc.) if needed.
What if there’s a manufacturing defect?
Fi EXHAUST covers manufacturing defects under their published warranty. FFP coordinates the claim directly with Fi on your behalf — you don’t deal with Taiwan customs or factory back-and-forth. Defects are rare; Fi has built valvetronic systems since 2013 and the QC is industry-leading.
Can I get faster shipping?
The 4–8 week window is dominated by production time, not shipping. Air freight is included. There is no “rush production” option from Fi.
QUIET STREET.
RACE TONE.
SAME SPORT BUTTON.
Direct-fit T304 stainless valvetronic catback for the 992.1 GT3 and GT3 RS. One toggle takes the cabin from near-stock cruise volume to unfiltered 4.0 flat-six rasp at high RPM. Bolt-on. No tune. No CEL.
$4,800
· 5 tip finishes available
4.0L H6 / 9A1
Direct Bolt-On
100mm Tips
Built to Order · 4–8 wks
Five Tip Finishes Available
ONE CATBACK.
TWO PERSONALITIES.
A complete cat-back exhaust system that swaps the OEM muffler section on a 992.1 GT3 and GT3 RS. T304 stainless throughout. Mandrel bent. TIG welded. The muffler chamber houses Fi’s Frequency Intelligent valve — close it for near-stock cabin volume on the daily, open it for unfiltered 4.0 flat-six rasp at full throttle.
The valve runs off the factory PSE signal — the same Sport button you already use to wake up the OEM active exhaust. No extra wiring. No ECU flash. No remote required. Fi’s Pro remote is optional if you want manual override outside of Sport mode.
CIVIL TO FERAL
ON DEMAND.
Valves Closed
4–6 dB above stock at idle and cruise. Cabin volume is daily-driver civil. No drone at 70 mph in 6th. Sport mode raises it half a notch and stays composed. This is your morning coffee run.
+4–6 dB @ idle
No drone
OE-spec cruise
Valves Open
The muffler restriction is bypassed. The 9A1 flat-six runs unfiltered — sharp, mechanical, race-spec. The valvetronic plate lifts at higher RPM and on full throttle. Track-day character on a road-legal package.
+8–12 dB @ WOT
Full mid-pipe flow
Race tone
YOU CAN’T DYNO
A SOUNDTRACK.
Fi’s official sound demo for this catback on a 992.1 GT3 RS. Headphones recommended — cabin and exterior captures, valves closed and open. Want the upgrade-path tone? Tap the side card for the full Race Version setup (catless headers + this catback).
Featured · Fi 992.1 GT3 RS Valvetronic Muffler · Cabin & Exterior
LIGHTER THAN OEM.
MEASURABLY.
The factory 992 GT3 RS exhaust weighs 37.2 lb (16.87 kg). Fi’s valvetronic catback drops that to 12.6 kg — about 25% lighter, all from the muffler-section swap alone. Less mass behind the rear axle, less rotational inertia in the chassis, more freedom in the rev range. Independent dyno on Fi’s full Race Version (catless headers + this catback) shows up to +25 WHP across the mid-range without ECU tuning — the platform breathes when you free it up.
16.87
KG / 37.2 LB
12.6
KG / 27.8 LB
Weight savings — muffler section swap only. Source: Fi EXHAUST published spec.
WHAT’S IN
THE BOX.
- ▸ Mid-pipe to muffler section, T304 stainless, mandrel bent & TIG welded
- ▸ Valvetronic muffler with single integrated Frequency Intelligent valve
- ▸ 100mm OEM-position tip outlets in your chosen finish (Silver / Titanium Blue / Diamond Black / Gold / Carbon Fiber)
- ▸ OE-replacement bolt-on hardware (gaskets, clamps, hangers)
- ▸ Valve actuator harness with factory PSE plug-and-play connector
- ▸ Install instructions and torque spec sheet
Compatible with the factory OPF/catted downpipes that ship on US-spec 992.1 GT3 cars. Want a fuller setup? See the upgrade path below.
WHEN YOU WANT
MORE.
This catback is the foundation. Add either or both of these to extend the system. We’ll line them up for the same build window.
Fi Catless Header
PH-992GT3F-HDS4
Long-tube catless header pair. Replaces the OEM cat-equipped headers. Combined with this catback unlocks the mid-range gains documented on Fi’s Race Version dyno. CEL likely — tune or simulator required.
Race Version Full System
PH-992GT3F-FUOES4
The complete factory-exhaust replacement — long-tube catless headers, high-flow X-pipe, valvetronic muffler. Fi’s dyno-proven +25 WHP setup. Track-focused build.
WHAT IT FITS.
WHAT IT DOESN’T.
- Make / Model
- Porsche 992.1 GT3 and GT3 RS
- Model Years
- 2021 – 2025 (US and EU)
- Engine
- 4.0L Naturally Aspirated H6 — 9A1 family
- OPF / Non-OPF
- Both variants supported
- Drivetrain
- RWD and AWD (Targa 4 where applicable)
- Does NOT fit
- 992.1 Carrera or 992.1 Turbo — different chassis section. Ask us if you need those.
BOLT-ON.
NO TUNE.
Two-post lift, basic hand tools, no fab. Average shop time is 90–120 minutes for a competent tech. No tune required — the valve runs off the factory PSE control signal, so the ECU sees nothing new and there’s zero CEL risk on this catback-only setup.
“We install Fi catbacks weekly at the shop. On the GT3 chassis the trickiest part is trimming the OEM heat shield away from the new muffler — about 30 minutes of careful work the first time. After your first one the install drops to under 90 minutes. Want it installed? Bring it in or ship it to us — flat-rate install on Fi catbacks is on the service menu.”
Fi Dealer
Support
Install Shop
Performance
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FREQUENTLY ASKED QUESTIONS
If it's in stock and ready to roll, your order usually hits the road within 1–3 business days.
For made-to-order or specialty items (like carbon fiber parts or custom builds), the turnaround can take up to 8 weeks — perfection takes time.
Either way, we'll keep you updated so you know exactly when your parts are leaving the pit lane.
Absolutely! Once your order ships, you'll receive an email with a tracking link so you can follow its journey from our shop to your doorstep.
If your order ships via freight, you'll get a separate email with a direct link to the carrier's tracking page — easy and stress-free.
Things happen on the road — even to boxes. If your order arrives damaged, snap a few clear photos of the box and product and send them our way right away.
If your shipment is lost, just email or call us — we'll help track it down and guide you through the next steps to make it right.
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805-267-9762or email Support@FFPerformance.co
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