Blacked-out matte BMW M4 G82 with glowing laser headlights, cinematic dusk beauty shots
Founder-built · Bethlehem, PA Electronic valvetronic catbacks Ships June 2026

Loud is a setting.

One catback, two personalities — 304 stainless, TIG-welded, with electronic exhaust valves you command from the driver’s seat. Bolt-on. No tune. No CEL. 67 builds across 19 marques, from $1,679.

Reserve Your Build Shop by Brand

19

Marques

67

Builds

7d

Production

∞

Structural warranty

THE LINEUP BY MAKE

SHOP BY BRAND

Nineteen makes, every chassis we build. Pick your badge — it takes you straight to the kit.

01 / THE CORE LINEUP

Street

48 builds
BMW catbacksBMWAUDI catbacksAUDIMERCEDES-BENZ catbacksMERCEDES-BENZLEXUS catbacksLEXUSVOLKSWAGEN catbacksVOLKSWAGENINFINITI catbacksINFINITIHYUNDAI catbacksHYUNDAIJAGUAR catbacksJAGUARALFA ROMEO catbacksALFA ROMEO
02 / TUNER ROYALTY

JDM

8 builds
TOYOTA catbacksTOYOTANISSAN catbacksNISSANHONDA catbacksHONDASUBARU catbacksSUBARUMITSUBISHI catbacksMITSUBISHI
03 / THE FRONT ROW

Exotics

11 builds
PORSCHE catbacksPORSCHEFERRARI catbacksFERRARILAMBORGHINI catbacksLAMBORGHINIFORD catbacksFORDCHEVROLET catbacksCHEVROLET

Sec. 02 — Engineering

Built right.
Sold direct.

The full system, drawn to the kit we ship.
Flip the valves — watch it work.

QHCE // Valve control — live schematic Live
QHCE TRANSVERSE MUFFLER ELECTRONIC VALVES ×2 — CNC-BILLET · MUFFLER BYPASS OEM MID-PIPE FLANGES — BOLT-ON 12V ACCESSORY PLUG CONTROL MODULE — PLUG-AND-PLAY HARNESS X-PIPE CROSSOVER MANDREL-BENT 304L · 1.5–1.8MM WALL QUAD TIPS — CARBON UPGRADE · OEM-POSITION WIRELESS REMOTE — ON THE KEYRING KEY FOB + CABIN CONTROLLER INCLUDED QHCE-CB · REV 03 OPEN — STRAIGHT TO TIPS CLOSED — THROUGH THE MUFFLER

Output at the tip80 dBValves closed

Closed: 5–7 dB over stock. Cabin-civil cruise. Passes any noise meter. Civilians won't notice.

“It's a switch you flip from the keyring. That's the whole pitch.” — the founder

01

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

02

Electronic Valves

CNC-billet housing. Wireless remote, keychain fob, cabin controller.

  • No phone app, no subscription
  • 2-year electronics warranty
  • Spare actuator stocked stateside

03

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

04

Forever-Backed

Lifetime structural on the pipes. A real human answers your warranty email.

  • 2 years on electronics
  • Direct founder contact
  • Built to order in 7 days
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
SHOP THE 540i CATBACK

Sec. 04 — Beta testers

From the
garage.

Real cars, real installs —
the first three builds out the door

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

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

Drop status

First dropJune 2026
FormatSmall batches
QueueOrder received
Founder pricingLocked for 50

FOUNDING50

Claim your build

Use code FOUNDING50 at checkout · Pre-orders ship in order received

Sec. 05 — FAQ

Short answers to
long questions.

If yours isn't here,
the full FAQ has 10+ more

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.

No. Catback only — doesn't touch cats, downpipes, or any sensor the ECU monitors. No CEL, no tune required.

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.

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.

Lifetime structural warranty on the pipes. 2 years on electronics. 90 days on cosmetic finish (tips + laser engraving). Full terms on the warranty page.

Read all FAQs

Sec. 06 — The list

First drop.
First dibs.

Catbacks ship in batches of 9. The next batch goes to people on the list before it gets posted publicly. No spam, no daily emails — one note per restock.

One email per drop · Unsubscribe anytime

  • For off-road / track use only
  • Not legal for highway use in all 50 states
  • Buyer assumes responsibility for local compliance
  • For off-road / track use only
  • Not legal for highway use in all 50 states
  • Buyer assumes responsibility for local compliance
  • For off-road / track use only
  • Not legal for highway use in all 50 states
  • Buyer assumes responsibility for local compliance
  • For off-road / track use only
  • Not legal for highway use in all 50 states
  • Buyer assumes responsibility for local compliance