Two Step Performance · Hibiki Series

The Only
 One

Valved · Frontpipe-Back · FE1 Civic Si · 22–26

The 11th generation Si has been out for quite a few years now and nobody has built a valved exhaust for it. That’s where we come in.

Add to cart — $1,299.99 Confirmed fitment: 2022–2026 Civic Si
Front end of a Honda Civic Si showing the Si badge and grille

The whole story

Why we built it.

Nobody had made a valved exhaust for the 11th generation Honda Civic Si / FE1, so we did. Here’s how that went, and what it sounds like on both sides of the valve.

500 miles in

He leaves the valves closed in the morning so he doesn’t wake the neighbors, then opens them when he wants to hear the car. Deep tone, plenty of burbles, and even at full throttle on the non-resonated pipe he says it never gets harsh or obnoxious…not the “AutoZone Special.”
Owner photo of the TSP Hibiki dual-exit exhaust installed on a Honda Civic Si, viewed from below on a lift
His car, on the lift · Owner-submitted

Verified owner · Miami, FL · City, highway, traffic and spirited driving
Non-resonated midpipe · Stock downpipe and frontpipe

Loud is easy.
Quiet on demand is the hard part.

Until now, the choice was the one everybody knows. Go loud and accept that a four-hour drive turns into a headache somewhere around 2,400 rpm, or stay quiet and wonder why you bought a Si.

That choice shouldn’t be a sacrifice. It’s picking which half of the car you stop enjoying.

The Hibiki runs a remote-controlled valve. Closed, the volume drops and the highway drone goes with it; it will even tame an aftermarket catted and catless downpipe. Open, the car breathes. One button, from the driver’s seat. No app, no menus, no waiting for a phone to pair. Press the button and let her rip.

The remote-controlled valve actuator mounted on the TSP Hibiki mid-pipe
The valve · This is the whole idea

Both pipes, in the box

Four exhausts, one purchase.

Most valved systems make you pick resonated or non-resonated when you order, and then you live with it. We ship both.

Two midpipes and two valve positions means four distinct sound profiles from the same system. Not four variations on a theme - the quietest and the loudest are a long way apart.

Change your mind in six months? Change it back; the other pipe is already on your shelf.

Complete TSP Hibiki exhaust system laid out showing resonated and non-resonated midpipes and the valve controller

Quietest to loudest

  1. 01 Resonated · valve closed Quiet enough for a 6am start and a four-hour highway run.
  2. 02 Non-resonated · valve closed Still civil, with more of the car coming through underneath.
  3. 03 Resonated · valve open Loud on demand without committing to it full time.
  4. 04 Non-resonated · valve open The loudest, rawest version of this platform.

One and four are the two exhausts most people are choosing between when they shop. Here they’re the same part, and the difference is a midpipe swap and a button.

The install

You won’t see any of it.

The controller wires in with a fuse tap and tucks up behind the trim. Nothing added to the dash, nothing to route around your knees. Once it’s in, the only sign it’s there is the fob in your pocket.

It’s also the fiddliest part of the job. Bolting the exhaust up is straightforward, but getting the wiring into the cabin and doing it neatly is what takes the time. Worth doing properly.

It looks like it came that way. OEM+, as some call it.

TSP technician routing the Hibiki valve controller wiring under the dash of a Honda Civic Si

Developed on our own car

Every bend was validated on a real Si.

This isn’t an off-the-shelf design with a new sticker on the box. The Hibiki was developed and tested on the TSP FE1, our shop car, over real miles. Every bend, hanger and flange was checked on the actual platform.

That’s also why the confirmed fitment list is short. A car goes on the list after it’s been on the lift, not before.

The TSP FE1 Honda Civic Si at speed, the shop car the Hibiki valved exhaust was developed on
The TSP FE1 · Every mile of development happened on this car · See the build
Removing the factory exhaust from the TSP FE1 shop car during Hibiki development
Factory system coming off
The TSP Hibiki exhaust installed underneath the TSP FE1, showing dual exit routing and hangers
Hibiki fitted · Hangers, flanges, routing

Not on the list yet

Non-Si 1.5T? Integra? Read this.

We think the Hibiki fits more cars than the ones we’ve confirmed. We just haven’t proven it, and we’re not going to sell you a $1,300 exhaust on a hunch.

Suspected, not confirmed

  • 2022–2025 Honda Civic 1.5T, non-Si sedan trims
  • 2023–2026 Acura Integra 1.5T
  • Civic hatchback trims

There’s one thing you can check yourself right now. Look under the back of the car. The Hibiki needs rear exhaust hangers on both sides, driver and passenger. Not every 1.5T car has both. If yours only has one, this system won’t mount no matter what the badge says.

If you’ve got both hangers and you’re willing to let us test fit, we want to hear from you. That’s the only way anything gets verified: somebody puts a car on a lift.

Help us confirm your car

Tell us the year, trim, whether you’ve got both rear hangers, and detailed photos of your setup.

The details

Where the money went.

Polished 4 inch TSP-etched exhaust tip on the Hibiki valved exhaust system
Polished 4″ tips, etched
Flange and mandrel-bent pipe ends of the TSP Hibiki exhaust on the bench
Flanges and mandrel bends
TIG welded joint where the pipe meets the muffler body on the TSP Hibiki 304 stainless exhaust
304 stainless · TIG welded throughout

Specifications

Part numberTSP-HC11-HIBIKI-POL
SystemFrontpipe-back, dual exit
Material304 stainless
Piping3″ mandrel-bent, TIG welded
TipsPolished 4″
ValveRemote fob, fuse-tap wiring
MidpipesResonated & non-resonated
Fitment2022–2026 Civic Si
Warranty1 year

What’s in the box

  • Frontpipe-back dual-exit system
  • Resonated and non-resonated midpipes
  • Remote control fob
  • Valve controller and wiring
  • Hardware kit: bolts, gaskets, nuts, clamps
  • Adjustable hanger rubber mounts

Before you buy

Will it drone?
Closed, no. That’s the entire point of the valve. Open, it’s an exhaust; it’s supposed to be loud! But still no drone.
Do I need a tune?
No. It’s a frontpipe-back system, so it doesn’t touch anything the ECU is watching.
Will it work with my aftermarket frontpipe?
Yes. It’s designed to bolt up to both factory and aftermarket frontpipes, so it fits a stock car and a built one the same way.
What about the hatch, a non-Si 1.5T, or an Integra?
Not confirmed yet, and we won’t sell you one until it is. They’re all on the list to test. If you’ve got one and you want to help us confirm it, get in touch; that’s how the list gets longer!
How hard is this install?

Middle of the road. It’s a frontpipe-back system, so you’re working under the length of the car and you’ll want it up in the air. Doable on jack stands if you’re patient, a lot easier on a lift.

The exhaust itself is bolt-on. The part that takes the longest is the valve controller, since the fuse-tap wiring means running it into the cabin and doing it cleanly rather than just plugging something in.

After it’s on

Show us your car.

Once yours is bolted up, tag us. We pull customer cars for our social feeds regularly, and the good ones end up on this page. There’s only so much a page full of our own shop car can tell you.

Sound clips especially. Tell us which midpipe you’re running and whether the valve is open or closed, because those four configurations sound like four different exhausts and people want to hear all of them.

Find us

Tag @twostepperformance and use #TSPHibiki so we can find it.

Nobody built one, so we did.

Confirmed fitment: 2022–2026 Honda Civic Si

Add to cart — $1,299.99

Running a non-Si 1.5T, or an Integra 1.5T? Read the full fitment breakdown.

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