Why the 2023 Acura Integra's Exhausts Are Shaped Like Curly Fries
If you were to find yourself beneath a new 2023 Acura Integra—or the mechanically related Honda Civic Si—we sure hope it's not because you were just run over. In that case, you might have more pressing things to worry about than the odd routing of the dual exhausts under the back bumper. But, hey, pretend you're on the ground, under an Acura or a Honda, wondering why there are pipes aft of the exhaust outlets shapes like curly fries. We were similarly curious (having put ourselves on the ground, under an Acura Integra, on purpose) and did some digging with Acura for answers.
What Does a Normal Exhaust Look Like?
Normally, exhaust piping follows relatively straightforward routes from the engine to wherever the gases are intended to exit—usually the car's rear end. This typically manifests as straight-as-possible piping leading from the headers, which collect gases from each of the engine's cylinders in individual pipes and merge them into one or two outlets that flow into a catalytic converter, to a series of resonators (for shaping or quieting the noise) and mufflers and, finally, the tailpipes.
There are a few bends here and there, mostly so the piping can clear things like the rear suspension, the fuel tank, or other obstacles, but conventional wisdom holds that they don't double back on themselves or otherwise make any unnecessary trips side-to-side.
How the Acura Integra's Exhaust Looks
The Integra's post-cat piping (aft of the catalytic converters) is a bit different. As we mentioned previously, this setup is nearly identical on the Honda Civic Si, which shares a platform, engine, transmission, and general layout with the new Integra. While the piping follows a relatively traditional central pathway rearward, toward the back of the Integra, via a small tunnel, upon reaching the rear axle area, it splits into a T-shape, with one pipe turning to the right and another to the left.
These two pipes bend slightly rearward and lead to small resonators, one per side, before taking a 120-ish-degree bend toward the vehicle centerline, followed by another (by which point the pipes are now flowing toward the front of the car), followed by another bend that points the piping back to the side of the car, and finally a gentler 60-ish-degree bend that spits the exhaust straight back, out from beneath the Integra's rear bumper. Why?
According to Honda, those squiggles in each exhaust outlet are, in fact, silencers. They serve essentially the same function as a muffler—Honda calls them "coiled-type silencers"—and their curious shape is highly intentional. While, like everything on a modern vehicle, their shape is somewhat influenced by the allowable space within the bumper and underbody area behind the rear axle, the specific pathway that piping takes plays a crucial role in the surprisingly guttural low-rpm sound the Integra and Civic Si make.
By snaking the exhaust piping into that circular route, Honda is lengthening the exhaust pathway, lowering the resonance frequency without using a traditional muffler . Honda engineers tell us that the design as first installed in the Si also emphasizes the 300Hz to 600Hz frequencies "to deliver a more aggressive sound." Skipping the muffler, Honda also was able to achieve that sound with a 27-percent increase in exhaust flow.
Good Vibes, Different Volumes
The old Honda Civic Si, you'll recall, featured a central-exit exhaust that spit gases from two tailpipes clustered at the center of the bumper. Compared to the new Si and its Integra sibling, it used two large mufflers in a somewhat unusual configuration: The same central post-cat piping flowed into a T-split, with each pipe flowing into the end of a transversely arranged muffler, one on each side of the car. Gases exited those mufflers about an inch from the inlets, reforming into a T before the piping exited the back of the car.
Doing some visual measurements—okay, by the seat of our pants here—the new, muffler-less exhaust setup has more piping. I.e., it's longer, mostly by replacing the old car's length of muffler with pipe, and then spinning that around into loops at each rear corner of the car. It's cool to see the progression of this concept by the engineers, as the new and old setups are clearly somewhat related, only the new version sounds much better, particularly at idle and lower engine speeds. And that's all things being equal, literally. The new and old Si, and by extension, the Integra, utilize the same turbocharged 1.5-liter I-4 engine, and the 11th-generation Civic's platform—again, shared with the Integra—is a modified version of the 10th-gen setup. We didn't note any untoward booming, either, despite the exhaust note being audible in both the Honda and Acura at highway speeds.
For higher-rpm duty, Honda and Acura lean on Active Sound Control—in essence, augmented engine noises and, in the Acura, some active sound cancellation via the audio speakers—to amplify good noises and tamp down on less desirable ones. The tuning of these setups are different in each car; the Honda notably amplifies the engine note, more so in its Sport drive mode. In the Acura, we're told that augmentation was turned way down, with the focus pivoted from outright sporty volume to shaping the noises already in play for a more refined effect.
Of course, the sounds made by the 2023 Integra or the Honda Civic Si are only small parts of both compact cars' appeal. The Si is clearly sportier than the Integra, with a firmer ride and louder augmented noises and no available automatic transmission (you'll get the best-shifting six-speed manual available this side of a Porsche and like it), while the Integra delivers most of the Si's athleticism with greater overall comfort, refinement, and richer features. Both are fun to drive, attractive small cars. And owners of either one can blow plenty of hot gas about how weird their exhausts are.
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hyundai sonata Full OverviewWhen we first took stock of our 2020 Hyundai Sonata Limited, we were impressed by its slick screens, comfortable leather seats, and stylish exterior. A year later, does the Sonata continue to charm, or has it lost its luster?The midsize sedan rolled into our garage wearing a striking sapphire blue paint color and all the trimmings of the top-tier Limited model. At $34,630, our test car looks almost like a luxury sedan. Its plush caramel leather seats held up well over a year of passengers shuffling into seats, loading and unloading tons of baby gear, car seats installations, and baby spit-ups. The leather didn't pucker over time like it did on one of my previous long-term vehicles, which happened to be a luxury vehicle.The Sonata's interior earned high praise for its uncluttered, elegant design. I enjoyed the easy-to-use 10.3-inch touchscreen, though I didn't fully appreciate how crisp it was until I downgraded to a duller 8.0-inch screen in my latest test car. The Sonata's infotainment screen complements the 12.3-inch digital instrument cluster, and a sharp Bose sound system sweetens the deal.Passengers enjoyed the panoramic sunroof, but my favorite feature is Highway Driving Assist. A semi-autonomous system that combines adaptive cruise control and lane centering tech, this feature makes highway commuting less stressful. Although it has a tendency to steer the Sonata to the left side of the lane within the lane markings, it works better than some other systems we've tested. The 360-degree camera system is another winner, providing a clear view on all sides of the car and making it easy to park this long sedan. The only real tech hiccup we encountered was with the keyless entry system. It often wouldn't register when I touched the door and had the key in my pocket, forcing me to dig out the key and press the unlock button.I had no illusions about the Sonata's performance going into the year. Our car features the Sonata's upgraded engine option: a 1.6-liter turbocharged four-cylinder that makes 180 hp and 195 lb-ft of torque. As I quickly found out, it has just enough power for merging and passing other cars on the highway. Given how well it handles, I didn't mind its lack of power. What became more and more bothersome over time was how the power is delivered. There's a noticeable lag off the line when you jam the accelerator, so making quick maneuvers in traffic can get a little tricky.No maintenance problems plagued our Sonata through the year, but the car visited the dealership twice for routine servicing. Our first service trip was free, but Hyundai charged $92.01 for our second visit. 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More details?POWERTRAIN/CHASSIS 2020 Hyundai Sonata Limited 1.6T DRIVETRAIN LAYOUT Front-engine, FWD ENGINE TYPE Turbocharged I-4, alum block/head VALVETRAIN DOHC, 4 valves/cyl DISPLACEMENT 97.5 cu in/1,598 cc COMPRESSION RATIO 10.5:1 POWER (SAE NET) 180 hp @ 5,500 rpm TORQUE (SAE NET) 195 lb-ft @ 1,500 rpm REDLINE 6,500 rpm WEIGHT TO POWER 18.4 lb/hp TRANSMISSION 8-speed automatic AXLE/FINAL-DRIVE RATIO 3.37:1/2.14:1 SUSPENSION, FRONT; REAR Struts, coil springs, anti-roll bar; multilink, coil springs, anti-roll bar STEERING RATIO 13.3:1 TURNS LOCK-TO-LOCK 2.6 BRAKES, F; R 12.8-in vented disc; 11.8-in disc, ABS WHEELS 7.5 x 18-in cast aluminum TIRES 235/45R18 94V Michelin Primacy Tour A/S (M+S) DIMENSIONS WHEELBASE 111.8 in TRACK, F/R 63.1/63.3 in LENGTH x WIDTH x HEIGHT 192.9 x 73.2 x 56.9 in TURNING CIRCLE 35.9 ft CURB WEIGHT 3,316 lb WEIGHT DIST, F/R 60/40% SEATING CAPACITY 5 HEADROOM, F/R 38.4/37.4 in LEGROOM, F/R 46.1/34.8 in SHOULDER ROOM, F/R 57.9/56.1 in CARGO VOLUME 16.0 cu ft TEST DATA ACCELERATION TO MPH 0-30 2.7 sec 0-40 3.8 0-50 5.5 0-60 7.4 0-70 9.5 0-80 12.3 0-90 15.6 0-100 — PASSING, 45-65 MPH 3.8 QUARTER MILE 15.7 sec @ 90.1 mph BRAKING, 60-0 MPH 115 ft LATERAL ACCELERATION 0.89 g (avg) MT FIGURE EIGHT 26.6 sec @ 0.66 g (avg) TOP-GEAR REVS @ 60 MPH 1,800 rpm CONSUMER INFO BASE PRICE $34,475 PRICE AS TESTED $34,630 STABILITY/TRACTION CONTROL Yes/Yes AIRBAGS 9: Dual front, f/r side, f/r curtain, driver knee BASIC WARRANTY 5 yrs/60,000 miles POWERTRAIN WARRANTY 10 yrs/100,000 miles ROADSIDE ASSISTANCE 5 yrs/Unlimited miles FUEL CAPACITY 15.9 gal EPA CITY/HWY/COMB ECON 27/37/30 mpg RECOMMENDED FUEL Unleaded regular Our Car SERVICE LIFE 12 mo / 11,734 mi BASE PRICE $34,475 OPTIONS Carpeted floor mats ($155) PRICE AS TESTED $34,630 AVG ECON 24.4 mpg PROBLEM AREAS None MAINTENANCE COST $0 (oil change, inspection) NORMAL-WEAR COST $0 3-YEAR RESIDUAL VALUE* $27,700 (80%) RECALLS None *IntelliChoice data; assumes 42,000 miles at the end of 3-years Show All
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