27WON Exhaust | 22+ Civic Si, 23+ Integra

A two phase resonator is perfectly placed on each side of the car to give this system both a clean look and deep sound. This two phase system uses an expansion chamber resonator and an absorption resonator to remove both high and low frequencies and allow the exhaust gases to pass straight through which reduces back-pressure to increase performance potential.

Dual 100mm polished tips with our signature logo plates enhance the premium look of your Honda Civic. These are made from the same stainless steel as the rest of the system and are designed to perfectly fill the space in the bumper cutout.

Improving exhaust flow is a huge key to enhancing the performance of your engine. To do this we increased the exhaust piping diameter from 50mm up to 63.5mm to reduce back pressure and make it easier for hot spent exhaust gases to leave your turbocharger. This results in a 58% increase in cross-sectional area to support future power modifications and also delivers a nice deep tone.

Choose your volume. The 27WON exhaust system for the 11th generation Honda Civic Si can be had in 3 different configurations. Choose from a front-pipe back only system, with a 2.5" high-flow front pipe, or as a full turbo-back exhaust system which comes with our 80mm high-flow catted downpipe.

You can piece this system together at your own pace or bundle them all and save by purchasing the entire system at once.

All 27WON exhaust systems are made from T304 stainless steel tubing that is CNC mandrel bent and precision TIG welded. All of the pipes are then completed in a brushed finish for an exhaust that will look as new years from now as the day you took it out of the box.

Slip joints are cheap and often are a pain. 2-bolt flanges are prone to leaks which also make them less than ideal. This is why we offer our system with 3-bolt flanges. This method of attaching the exhaust system is optimal for both sealing and perfect alignment during install. Rounding out this complete package included is a set of perfectly matched custom gaskets so you'll get a system that won't leak and will last the life of your vehicle.

Not only do you want to make power and sound good, but it's just as important to look good too. We spent the time dialing in the optimal hanger locations and flange orientation to ensure perfect fitment. Our slotted bolt holes and lengthened hanger rods allow you to dial in how the system sits underneath the car to give you that spot-on look you're after.