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Full Titanium Quad-Tip Cat-Back That Lets the GR Corolla Breathe and Sound Like it Means It
The REMARK RK-C4076T-05T Elite Spec Full Titanium Quad-Tip Cat-Back Exhaust is the flagship exhaust system for the 2023+ Toyota GR Corolla, engineered for drivers who want maximum flow, minimum weight, and a sound character that matches the 1.6L turbocharged G16E-GTS engine. RK-C4076T-05T uses 3-inch 16-gauge T304 stainless steel mandrel-bent piping throughout, a straight-through resonator on the midpipe, and a high-flow rear muffler canister to reduce backpressure across the entire RPM range. The quad-tip configuration exits with four 4-inch polished stainless steel outer tips surrounding a center 4.5-inch burned titanium cover tip, creating a visually aggressive rear-end presentation unique to the GR Corolla platform. A large OEM-style exhaust valve is integrated into the center exit, preserving the factory valve function for quiet cruise modes. The RK-C4076T-05T is a bolt-on two-piece design that installs without cutting or welding.
Key Features
- Full titanium and T304 stainless steel construction for maximum weight savings and corrosion resistance
- 3-inch mandrel-bent T304 piping throughout the cat-back section for zero restriction
- Quad-tip exit: four 4-inch polished stainless outer tips plus a 4.5-inch burned titanium center cover tip
- Straight-through resonator on the midpipe combined with a rear canister muffler for refined tone without rasp
- OEM exhaust valve integration retained in center tip for factory noise mode compatibility
- Two-piece bolt-on design, no cutting or welding required
- Fitment: 2023+ Toyota GR Corolla Core, Circuit Edition, and Morizo Edition
Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2023-2026 | Toyota | GR Corolla | Core |
| 2023-2026 | Toyota | GR Corolla | Circuit Edition |
| 2023-2026 | Toyota | GR Corolla | Morizo Edition |
Specifications
| Detail | Value |
|---|---|
| Part Number | RK-C4076T-05T |
| Brand | REMARK |
| System Type | Cat-Back Exhaust |
| Pipe Diameter | 3 inch |
| Pipe Material | 16-gauge T304 stainless steel, titanium |
| Tip Style | Quad-tip with burned titanium center cover |
| Outer Tip Diameter | 4 inch polished stainless (x4) |
| Center Cover Tip Diameter | 4.5 inch burned titanium |
| Exhaust Valve | OEM-compatible center valve retained |
| Install Type | Bolt-on, two-piece, no cutting or welding |
| Fitment | 2023+ Toyota GR Corolla (all trims) |
| UPC | Verify at point of sale |
What's Included
- Cat-back midpipe section with straight-through resonator
- Rear muffler section with quad-tip exit assembly
- Burned titanium center cover tip (4.5 inch)
- Four 4-inch polished stainless outer tips
- OEM exhaust valve adapter hardware
- Mounting hardware and gaskets
FAQ
Does the RK-C4076T-05T fit all GR Corolla trim levels?
Yes, it fits the 2023+ GR Corolla Core, Circuit Edition, and Morizo Edition. All three share the same underbody exhaust routing.
Does this exhaust retain the OEM exhaust valve?
Yes. The center tip assembly integrates an OEM-compatible exhaust valve adapter so the factory quiet mode functionality is fully preserved.
Will the RK-C4076T-05T trigger a check engine light?
No. This is a cat-back system that installs after the catalytic converter, so no oxygen sensor or catalyst-related codes are affected.
What is the sound level difference compared to stock?
The RK-C4076T-05T produces a noticeably deeper and more aggressive exhaust note under acceleration while remaining refined at cruise thanks to the rear canister muffler design.
Is any cutting or welding required for installation?
No. The system is a two-piece bolt-on design that uses the factory hangers and OEM attachment points. No modifications to the vehicle are required.
How much weight does the RK-C4076T-05T save over the stock exhaust?
REMARK does not publish an exact weight figure, but full titanium and T304 construction provides significant weight savings over the OEM stainless and mild steel system.
What is the pipe diameter of the RK-C4076T-05T?
3-inch mandrel-bent T304 stainless steel piping throughout the cat-back section, which is larger than the factory system and reduces backpressure at high RPM.
Does REMARK offer a warranty on the RK-C4076T-05T?
REMARK products are backed by a manufacturer warranty against defects in materials and workmanship. Contact REMARK or your authorized dealer for specific warranty terms.
Can the RK-C4076T-05T be used with a downpipe upgrade?
Yes. The cat-back system is independent of the downpipe and connects at the standard mid-pipe junction, making it compatible with aftermarket downpipe upgrades.
Installation Notes
- Allow the factory exhaust to cool completely before beginning removal.
- Support the OEM exhaust from below and remove the factory hangers from the rubber isolators.
- Disconnect the OEM exhaust at the midpipe flange and remove the rear section.
- Route the RK-C4076T-05T midpipe section and connect to the factory flange, hand-tighten hardware.
- Hang the rear muffler section on the factory rubber isolators and connect to the midpipe.
- Align the quad-tip assembly for even clearance and torque all flanges to spec.
- Reconnect the OEM exhaust valve wiring harness to the center tip adapter.
- Start the vehicle and check for leaks at all connection points before driving.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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