Quick answer
You can install a catback exhaust on the Acura Integra Type S DE5 in about 2 to 3 hours with basic hand tools, a jack, and jack stands. The key is confirming the system connects to the factory downpipe, since some catbacks require replacing the front overpipe.
Why the overpipe connection matters before you start
Before you lift the car, check the flange size where the catback meets the factory downpipe. Some Integra Type S catback systems, like the Sports Touring Catback Exhaust for the 2023+ DE5, use a 3-inch front overpipe with a flex joint and will not bolt to the factory front overpipe because the flange sizes differ. If you buy a system with a different flange, you need to swap the front overpipe at the same time or the install stops at step one.
This is the main reason to confirm your kit's flange before ordering. A true 3-inch system that starts at the end of the downpipe gives you a single continuous path, but it also means the factory overpipe stays off the car. That is not a defect; it is how the system is designed to fit.
Integra Type S Catback Install Steps
- Prepare the car and tools: Park on a flat surface, chock the rear wheels, and support the car on jack stands. Let the exhaust cool completely. You will need a 12mm socket, 14mm socket, 17mm socket, ratchet, breaker bar, penetrating oil, and a rubber mallet. Use a floor jack and stands, never a single jack. Spray penetrating oil on every flange bolt the night before; it saves time when the nuts are hot-cold cycled and corroded.
- Remove the factory catback: Start at the rear and work forward. Support the factory system with a jack or stand, loosen the rear hangers first, then the midpipe clamps, and finally the front overpipe connection. Keep the factory rubber hangers and reuse them if they are in good shape. Have a second person or a floor jack support the muffler section so it does not drop and bend the hanger studs.
- Inspect the downpipe flange: Check the flange face on the downpipe for rust, debris, or a warped gasket. The REMARK system starts at the end of the downpipe, so the flange must be clean before the new overpipe goes on. If the factory gasket is damaged, replace it before installing the new system.
- Dry-fit the front overpipe and midpipe: Loosely assemble the front overpipe, midpipe, and rear section. Do not tighten clamps yet. The overpipe uses a 3-inch flange and will not mate with the factory front overpipe, so verify that you are using the included overpipe and that the flange aligns with the downpipe outlet. Confirm the flange size before you torque anything; the factory overpipe will not bolt up.
- Hang the system and align the tips: Support the midpipe and rear muffler with the factory hangers, then align the 4.5-inch tips to the bumper opening before final torque. Leave the clamps loose until the tips sit evenly and the pipe clears the chassis and subframe. Check tip alignment and clearance before tightening any clamp.
- Torque and leak-check: Tighten the flange bolts and clamps to spec in a crisscross pattern, then start the engine and check every joint for exhaust leaks. Recheck the hardware after a heat cycle because gaskets and hangers settle. Re-torque after the first heat cycle and listen for rattles against the underbody.
What the REMARK kit includes
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Sports Touring Catback Exhaust - Acura Integra Type S DE5 (2023+): This 3-inch catback for the 2023+ Integra Type S starts at the end of the downpipe and includes a 3-inch front overpipe with flex joint, a mandrel-bent midpipe with a large resonator, a single rear muffler, and triple dual-wall 4.5-inch tips. Because the kit replaces the factory front overpipe, you don't need to reuse the stock flange, which simplifies the install and removes a common fitment headache.
Sports Touring Catback Exhaust - Acura Integra Type S DE5 (2023+)