HKS Skyline GT-R Exhaust Comparison: R32/R33/R34 RB26

Choosing the right HKS Skyline GT-R exhaust comes down to three purpose-built systems for the RB26DETT: the race-minded Super Turbo Muffler, the street-refined Silent Hi-Power, and the value-focused Hi-Power 409. The RB26DETT is a 2.6L (2,568cc) twin-turbo, DOHC 24-valve inline-six that Nissan factory-rated at 276 hp (280 PS) and roughly 289 lb-ft — the famous JDM gentleman’s-agreement ceiling that every tuner immediately blows past. This comparison breaks down how each HKS system flows, sounds, and fits across the R32 (BNR32, 1989–1994), R33 (BCNR33, 1995–1998), and R34 (BNR34, 1999–2002) chassis, with real prices from $1,140 to $1,600.

Why the RB26DETT Needs a Purpose-Built Exhaust

The RB26DETT is a boost-fed engine, and boost-fed engines live or die on exhaust flow. Nissan’s twin-ceramic-turbo (or steel, in later cars) layout was choked from the factory to hit the 276 hp figure, so the single biggest bang-for-buck bolt-on on a Skyline GT-R is a free-flowing cat-back that lets the RB26 breathe. A quality HKS system reduces backpressure after the turbines, sharpens throttle response, drops spool-up lag, and unlocks the deep, metallic RB straight-six howl that made Godzilla a legend. HKS builds three distinct exhaust families for this platform, and each one targets a different owner.

All three systems here are JASMA-numbered (the Japan Automobile Sports Muffler Association standard), which matters because it certifies the exhaust to a documented sound level rather than an unregulated open pipe. In our Tampa shop, that certification is also what keeps a GT-R civil enough to drive to a meet without a headache — the RB26 makes plenty of noise on its own.

HKS Super Turbo Muffler: Maximum Flow for Big-Turbo RB26 Builds

The HKS Super Turbo Muffler is the flow king of the three. It runs an 85mm (3.3in) straight-through center pipe capped by a large 124mm polished tip, and it is built from SUS304 stainless steel. HKS designed the 85mm straight pipe specifically so it works on everything from a stock-turbo RB26 to a heavily upgraded turbine setup — the pipe is not the restriction. On the BNR32 it measures 96 dB (versus a 93 dB stock system), and on the BNR34 it actually comes in at 94 dB against a 95 dB factory exhaust, so it is loud under throttle but composed at cruise. This is the system we recommend for any GT-R chasing 400+ hp.

HKS Silent Hi-Power: Refined Street Sound Without the Drone

The HKS Silent Hi-Power is the street-refined choice. It is built entirely from SUS304 stainless and adds a dedicated “Silent Chamber” that scrubs low-frequency noise — the exact frequency that turns into cabin drone on the highway. Because the chamber is a closed-end design, only a minimal amount of exhaust gas ever enters it, so it kills drone with almost no cost to flow. For a GT-R that gets driven to work and on weekend canyon runs, the Silent Hi-Power gives you the HKS bark when you want it and a livable cruise when you don’t. It is the system we point daily-driver GT-R owners toward first.

HKS Hi-Power 409: The Value RB26 Cat-Back

The HKS Hi-Power 409 is the smart-money entry point at $1,140–$1,150. HKS builds the exhaust tip and end muffler from bright SUS304 stainless, while the piping and muffler body use SUH409 stainless. That is not a corner cut — SUH409 actually absorbs more sound than SUS304 and resists thermal expansion better, which is what lets HKS run an aggressive straight-through design without it turning obnoxious. The coated SUH409 piping is also what keeps the price down. You get the classic Hi-Power tone and real flow for hundreds less than the premium lines, which is why it is a perennial best-seller for R32 and R33 owners.

HKS Skyline GT-R Exhaust Comparison Chart

Here is how the six HKS RB26 exhaust systems we stock line up head to head. Rows are sorted by price; the Super Turbo Muffler for the R34 is our overall top pick for a performance build.

How to Choose: Super Turbo vs Silent Hi-Power vs Hi-Power 409

Pick the exhaust that matches how you drive. Choose the Super Turbo Muffler if your GT-R is a track or big-power build — the 85mm straight-through pipe is the one that will not choke a 500+ hp RB26. Choose the Silent Hi-Power if the car sees real street miles and you want to keep drone out of the cabin without giving up the RB26 character. Choose the Hi-Power 409 if you want the most exhaust for the money and a classic HKS tone, which suits a stock-to-mildly-modified R32 or R33 perfectly.

One point our Tampa techs stress: an exhaust is a system. The Super Turbo Muffler and Silent Hi-Power are rear muffler sections engineered to pair with HKS front pipes and downpipes, so if you are running a big single or upgraded twins, budget for the matching front-end piping to see the full flow benefit. On a stock-turbo car, any of the three is a genuine bolt-on that wakes up throttle response immediately.

Fitment by Chassis: R32, R33 and R34

HKS engineers each system to a specific Skyline GT-R chassis code, so ordering by generation matters. The R32 (BNR32) built from 1989–1994 is served by the Super Turbo Muffler, Silent Hi-Power, and Hi-Power 409. The R33 (BCNR33) from 1995–1998 is covered here by the Hi-Power 409. The R34 (BNR34) from 1999–2002 gets both the Super Turbo Muffler and Silent Hi-Power. Every one of these bolts to the factory RB26DETT hardware — no cutting or fabrication required — and each carries its own JASMA number for a documented sound rating. If you are unsure which chassis code your GT-R is, our Tampa, FL team can confirm fitment by VIN before you order.