304L STAINLESS
1.5–1.8mm wall. TIG-welded. X-ray inspected. Will outlive the chassis.
- Mandrel-bent on a CNC fixture
- Back-purged welds throughout
- Heat-shielded muffler section
LAUNCH OFFER · LIMITED TO 50 BUILDS
The Founding 50.
The first 50 builds get founder pricing — locked in, never repeated.
$150OFF YOUR BUILD
CARBONFREE TIP UPGRADE
FREEGROUND SHIPPING
CLAIM YOUR BUILD →
USE CODE FOUNDING50
FOUNDER-BUILT · BETHLEHEM, PA · EST. 2026
Built for the throttle. Tuned for the street.
Electronic valvetronic catback systems for 67 builds across 19 of the most-tuned marques. 304 stainless. Carbon fiber tips. Remote-controlled.
FIND YOUR FIT
SELECT YOUR VEHICLE
7d
PRODUCTION TIME
Built-to-order. TIG-welded. QC'd before it leaves the floor.
100%
BOLT-ON FIT
Direct to OEM mid-pipe flange. No cutting. No tune. No CEL.
∞
STRUCTURAL WARRANTY
Lifetime on the pipes. 2 years on every electronic.
1
FOUNDER, NO CALL CENTER
You email hello@qhce, you get the guy who welded the first one.
REAL BUILD
FOUNDER'S BUILD
REAL B58, REAL SETUP
This is my daily. G30 540i running the QHCE valvetronic catback behind a real supporting setup — not a press car, not a rental, not an actor. Same driver, same build, every demo.
- CarBMW G30 540i
- EngineB58 3.0T
- TuneMHD Stage 2 — Burble Tune
- DownpipeVRSF Downpipe
- ExhaustQHCE Valvetronic Catback
WHY QHCE
Built right.
Sold direct.
Four things every QHCE kit ships with. No spec sheet asterisks. No "upgraded" SKU you have to chase.
ELECTRONIC VALVES
CNC-billet housing. Wireless remote, keychain fob, cabin controller.
- No phone app, no subscription
- 2-year electronics warranty
- Spare actuator stocked stateside
BOLT-ON, NO TUNE
Direct to OEM mid-pipe flange. No cutting, no welding, no CEL.
- 1.5–3 hours on a lift
- Gaskets + V-band clamps included
- Doesn't touch cats or sensors
FOREVER-BACKED
Lifetime structural on the pipes. Real human answers your warranty email.
- 2 yr on electronics
- 1 yr on cosmetic finish
- Direct founder contact
HOW IT WORKS
ELECTRONIC
VALVETRONIC.
REMOTE CONTROLLED.
Valves closed: 5-7 dB over stock. Cabin-civil cruise. Pass any noise meter. Valves open: full personality, war-cry on cold starts, snap-shut at idle.
You control it. Wireless remote in the glovebox. Key fob switch on your keychain. In-cabin controller in the cup-holder pocket. No app. No subscription.
READ THE FAQHEAR IT BEFORE YOU BUY
One kit.
Two completely
different cars.
Valves closed for the morning coffee run. Valves open for the canyon. Same hardware — you choose which one you're driving today.
“It's a switch you flip from the keyring. That's the whole pitch.”
OEM STOCK
75 dB
QHCE OPEN
95 dB
SOUND PROFILE
Open: deep snarl idle, gear-shift crack on WOT, throttle-blip burble on lift.
WHAT BETA TESTERS SAID
FROM THE GARAGE.
★★★★★
“Sounds like an M-car factory option. Cabin is dead quiet with the valves closed. WOT with them open and my neighbors hate me. Bolt-on was 90 minutes on a lift.”— Marco D., 2022 BMW G30 540i · Allentown, PA
★★★★★
“I was about to drop $2,800 on another brand’s catback. Glad I waited. This kit is better-welded, sounds better, and was half the price. Carbon tips look factory.”— Anthony R., 2023 BMW G22 M440i · Brooklyn, NY
★★★★★
“The remote is the move. I leave it on the keyring. Apartment garage in the morning — valves closed, no neighbor problems. Highway with friends — valves open. Zero compromises.”— Jordan P., 2021 BMW G80 M3 · Stamford, CT
FREQUENTLY ASKED
SHORT ANSWERS
TO LONG QUESTIONS.
If yours isn’t here, the full FAQ page has 15+ more.
READ ALL FAQS →Does this fit my car?
If your car is on our supported chassis list, yes — bolt-on to the OEM mid-pipe flange. No cutting, no welding. Each product page lists exact year + engine compatibility.
Do I need a tune?
No. Catback only — doesn’t touch cats, downpipes, or any sensor the ECU monitors. No CEL, no tune required.
How loud is it?
Valves closed: 5-7 dB over stock (cabin-civil, noise-meter friendly). Valves open: full personality — deep snarl on cold starts, war-cry on WOT.
When does my pre-order ship?
First inventory drop is June 1, 2026. Pre-orders ship in the order received. Northeast (PA/NY/NJ/CT) typically delivers 1-2 business days after we ship.
What’s the warranty?
Lifetime structural warranty on the pipes. 2 years on electronics. 90 days on cosmetic finish (tips + laser engraving).
