Corolla Hatchback Quiet Spec Exhaust with TOM'S Diffuser Fit Guide
By REMARK Exhaust | Published: 2026-10-29
Category: How-to Guides
Learn how to install the REMARK Quiet Spec catback exhaust and TOM'S Racing rear diffuser on your 2019-2022 Corolla Hatchback, including fitment checks and common mistakes.
Quick Answer
For a 2019-2022 Corolla Hatchback, the REMARK Quiet Spec catback exhaust pairs with the TOM'S Racing rear diffuser kit, but you must remove or modify the OEM diffuser and reuse the factory donut gasket and spring bolts.
Why the OEM Diffuser Must Go
The REMARK Quiet Spec catback exhaust is designed to work with an aftermarket diffuser like the TOM'S Racing unit. The OEM diffuser will not clear the new exhaust tips, so you have two options: remove it entirely or modify it to fit. Most owners choose the TOM'S Racing diffuser because it is a direct visual and functional match.
Keep in mind that the factory donut gasket and spring bolts at the connection to the OEM piping are reused. Do not discard them during the install—they are needed to create a leak-free seal.
Quiet Spec vs. Standard Axleback
The Quiet Spec is REMARK's tamer option, designed for daily driving. It reduces drone and keeps volume in check compared to a standard axleback. If you want a noticeable sound upgrade without the aggressive tone, this is the one to pick.
The catback system replaces more piping than an axleback, which can slightly change the exhaust note and free up a bit of flow. The tradeoff is a more involved install that requires working under the car for a longer stretch.
Installation Steps
- Prep the car and gather tools: Park on a level surface, chock the rear wheels, and lift the car with jack stands. You'll need a socket set, penetrating oil, and a torque wrench. Check that you have the factory donut gasket and spring bolts ready. Spray the exhaust hangers and bolts with penetrating oil the night before to ease removal.
- Remove the OEM diffuser: Unbolt the factory diffuser from the rear bumper. You may need to remove a few clips or screws. Set it aside—you won't be reinstalling it unless you plan to modify it. Take a photo of the clips' positions before removal to avoid confusion later.
- Disconnect the stock exhaust: Loosen the bolts at the connection to the OEM piping, and unbolt the hangers from the rubber mounts. Slide the stock catback out from under the car. Be careful not to damage the donut gasket—you'll reuse it. If the bolts are rusted, apply penetrating oil and wait a few minutes before forcing them.
- Install the REMARK Quiet Spec catback: Position the new catback under the car and connect it to the OEM piping using the factory donut gasket and spring bolts. Hand-tighten everything first, then torque to spec. Reattach the hangers to the rubber mounts. Leave the clamps loose until the entire system is aligned to avoid binding.
- Fit the TOM'S Racing rear diffuser: Align the TOM'S Racing diffuser with the exhaust tips and secure it to the bumper using the provided hardware. Ensure the tips sit centered in the diffuser openings. Adjust the exhaust hangers to center the tips before fully tightening the diffuser.
- Check for leaks and final torque: Start the engine and listen for exhaust leaks at the connection points. With the car still on stands, inspect the hangers and diffuser for clearance. Lower the car and do a final torque check on all bolts. A soapy water spray on the joints will reveal leaks—bubbles mean a bad seal.
Product Facts
- Sports Touring Exhaust Quiet Spec + TOM'S Racing Rear Diffuser Kit - Toyota Corolla Hatchback (2019-2022): This bundle includes the Quiet Spec catback exhaust and the TOM'S Racing rear diffuser kit for the 2019-2022 Corolla Hatchback. Buying them together saves money and ensures the diffuser is designed to pair with the exhaust's tip layout.
Sports Touring Exhaust Quiet Spec + TOM'S Racing Rear Diffuser Kit - Toyota Corolla Hatchback (2019-2022) - Sports Touring Exhaust Quiet Spec + TOM'S Racing Rear Diffuser Kit - Toyota Corolla Hatchback (2019-2022): The OEM diffuser must be removed or modified, or replaced with an aftermarket unit like the TOM'S Racing diffuser. You need to plan for diffuser removal before you start the install to avoid a surprise mid-project.
- Sports Touring Exhaust Quiet Spec + TOM'S Racing Rear Diffuser Kit - Toyota Corolla Hatchback (2019-2022): The factory donut gasket and spring bolts are reused at the connection to the OEM piping. Keep these original parts handy—they are essential for a proper seal and safe fitment.
