Next Level Performance
October 17, 2026 • 9 min read
A cat-back exhaust is the first bolt-on most owners add to a 2010–2022 Toyota 4Runner, and it is easy to see why: it wakes up the deep V6 growl of the 4.0L 1GR-FE, shaves a few pounds off the back of the truck, and — on the stainless kits — shrugs off road salt and Florida humidity far better than the rust-prone factory system. At our Tampa, FL shop we fit cat-backs on 4Runners almost every week, from daily-driven SR5s to trail-built TRD Pros, so we lined up the five systems our customers ask for most — from around $395 to about $775 — and compared material, diameter, exit style, sound, and real fitment.
Our Verdict
The MBRP 3-inch T304 stainless cat-back is our top pick for the 2010–2022 4Runner 4.0L.
It hits the sweet spot: full 3-inch mandrel-bent T304 stainless tubing, a clean bolt-on single side-exit that clears a hitch, a deep-but-livable tone, and a price that undercuts the premium kits. Want to spend less? The aluminized version of the same MBRP system runs around $395. Want the most aggressive note? Step up to the Borla S-Type. Building a trail rig? The aFe Hi-Tuck tucks the pipe up and away from the rocks.
Shop Our Top Pick →Why Upgrade the Cat-Back on a 2010–2022 4Runner?
A cat-back exhaust replaces everything from the catalytic converters rearward — the mid-pipe, resonator, muffler, and tailpipe — with wider, smoother, mandrel-bent tubing. Because it leaves the factory catalytic converters in place, a cat-back is 50-state street legal and will not trip a check-engine light or fail an emissions test.
The 4Runner’s 4.0L 1GR-FE V6 makes 270 hp at 5,600 rpm and 278 lb-ft at 4,400 rpm from the factory, routed through a restrictive, heavy stock system. On a naturally aspirated engine like this, be realistic about the dyno: a cat-back alone typically frees up only about 5–15 hp and a similar bump in torque, most of it in the mid-range. The real wins are the ones you feel and hear every day — a deeper, more purposeful V6 tone, a 10–20 lb weight reduction over the cast-iron factory muffler, slightly crisper throttle response, and corrosion resistance that outlasts the OE pipe by years.
Mandrel-bent 3-inch T304 stainless tubing flows more than the restrictive factory system.
One honest caveat up front: none of these kits adds meaningful power without a supporting tune and intake. Buy a 4Runner cat-back for the sound, the weight, and the long-term durability — not for a dyno headline. If you want airflow gains to go with it, pair your exhaust with a cold air intake for a bigger, better-breathing combo.
The 5 Best Cat-Back Exhausts for the 2010–2022 Toyota 4Runner
Every system below is confirmed to fit the 4.0L V6 4Runner and is in stock at NLP Performance. We picked a winner for each type of buyer — best overall, best budget, best dual-exit look, best sound, and best for off-road clearance.
1. MBRP 3-Inch T304 Stainless — Best Overall
This is the kit we recommend to most 4Runner owners. MBRP builds it from full 3-inch mandrel-bent T304 stainless steel — the most corrosion-resistant grade on this list — and finishes it with a single side-exit that tucks in ahead of the rear tire so it never fights a tow hitch or spare. The tone is a deep, confident V6 growl under throttle that settles into a quiet cruise, with no raspy top end. It is a true bolt-on: factory hangers, no cutting, no welding.
Key Specifications
What We Like
- + Full 3-inch T304 stainless — best rust resistance for salt and humidity
- + Deep, drone-free tone that stays civil on the highway
- + Single side-exit clears a tow hitch; genuine no-cut bolt-on
Things to Consider
- – Side-exit tip is more subtle than a dual setup
- – Around $235 more than the aluminized version of the same kit
2. MBRP 3-Inch Aluminized — Best Budget
Same 3-inch mandrel-bent design and the same deep MBRP tone as our top pick, but built from aluminized steel instead of stainless — which is how it comes in around $395 and earns the budget crown. Aluminized tubing resists rust well in dry and warm climates; in the heavy road-salt belt it will surface-rust sooner than T304, so northern buyers who keep their trucks a long time should weigh the stainless upgrade. For a Sun Belt 4Runner, this is the smart-money choice.
The Borla S-Type trades a quiet cruise for the loudest, most aggressive V6 note of the group.
3. Gibson Dual Sport Stainless — Best Dual-Exit Look
If you want the dual-tip look, the Gibson Dual Sport splits into twin 2.5-inch stainless pipes that exit behind the rear tire — a styling move that also keeps the tips away from a trailer when you tow. Gibson tunes it for a deep, authoritative tone with no interior drone, and it bolts on with no welding. It is backed by a limited lifetime warranty and, with its deep discount off the $1,345 list, it is one of the better values here for a stainless dual system.
4. Borla S-Type T304 — Best Sound
The S-Type is the loudest, most aggressive system in this guide — Borla’s signature “Sound of Power” built from patented multi-core, straight-through 2.75-inch T304 stainless. It is noticeably louder at wide-open throttle than the MBRP or Gibson, so it is the pick for owners who want everyone to hear the V6. Borla backs every system with its Million-Mile Warranty, the strongest coverage on this list. The trade-off is price and volume: it is the most expensive here, and it is more present on the highway than the mellower kits.
What We Like
- + Loudest, most aggressive tone — straight-through T304 stainless
- + Patented multi-core muffler technology for a clean note
- + Industry-best Borla Million-Mile Warranty
Things to Consider
- – Most expensive kit in this guide
- – More cabin presence on long highway drives than the MBRP or Gibson
5. aFe Mach Force-XP Hi-Tuck 409 — Best for Off-Road
Built for trail rigs, the aFe Hi-Tuck routes 2.5-inch 409 stainless tubing up and tight to the chassis so the pipe stays clear of rocks and ruts on the trail — valuable ground clearance if your 4Runner sees real off-road use. Importantly for TRD and KDSS trucks, aFe notes it fits 4Runners equipped with the Kinetic Dynamic Suspension System (KDSS), which some exhaust routings interfere with. Expect a moderate, deeper tone rather than the Borla’s roar. The 409 stainless is a step below T304 for long-term corrosion resistance but holds up well and keeps the price under the Borla.
4Runner Cat-Back Exhaust Comparison
| Kit | Material | Diameter | Best For | Price |
|---|---|---|---|---|
| MBRP 3in T304 StainlessTop Pick | T304 Stainless | 3 in, single side | All-around daily + trail | $629.99 |
| MBRP 3in Aluminized | Aluminized Steel | 3 in, single side | Budget builds (Sun Belt) | $394.99 |
| Gibson Dual Sport Stainless | Stainless | 2.5 in, dual rear | Dual-tip looks + towing | $632.72 |
| Borla S-Type T304 | T304 Stainless | 2.75 in | Loudest, most aggressive | $774.99 |
| aFe Mach Force-XP Hi-Tuck | 409 Stainless | 2.5 in, hi-tuck | Max off-road clearance | $750.00 |
T304 vs T409 vs Aluminized: Which Material Survives the Salt?
T304 stainless steel is the most corrosion-resistant exhaust material of the three and the best choice if you drive on salted winter roads or park near the coast. Here is how the grades on this list stack up:
T304 stainless (MBRP top pick, Borla): high chromium and nickel content, non-magnetic, and the slowest to corrode. It is the material you want for a truck you plan to keep, especially in the road-salt belt or humid coastal climates like our home base in Tampa.
409 stainless (aFe Hi-Tuck): a magnetic stainless with less chromium. It resists rust far better than plain steel and is a common OE-grade exhaust material, but it can develop light surface oxidation over many years. A great middle ground.
Aluminized steel (MBRP budget): carbon steel with an aluminum-silicon coating. It is the most affordable and performs well in warm, dry climates, but once the coating is nicked or the metal sees repeated salt exposure, it will surface-rust sooner than stainless. For a budget build in a mild climate it is a smart buy; for a northern daily driver, the stainless upgrade pays off.
Stainless tubing (T304 or 409) resists road-salt corrosion far longer than aluminized steel.
Installation, KDSS & Fitment Notes
A 4Runner cat-back is a genuine bolt-on that takes most DIYers about 45 to 90 minutes. Every system here reuses the factory hangers and clamps to the stock piping behind the catalytic converters — no cutting and no welding. You will need basic hand tools, a penetrating oil for the factory clamp bolts, and ideally a second set of hands (or a lift) to support the system while you set the hangers.
KDSS trucks: if your 4Runner has the Kinetic Dynamic Suspension System (common on TRD Off-Road and TRD Pro), confirm clearance before you buy — some exhaust routings run close to the KDSS plumbing. The aFe Hi-Tuck specifically lists KDSS compatibility, which is one reason it is our off-road pick.
Single vs. dual exit: a single side-exit (MBRP) is the most hitch- and trailer-friendly and the quietest. A dual rear exit (Gibson) looks the most aggressive and keeps both tips clear of a trailer. All of these are confirmed for the 2010–2022 4.0L V6; the same 1GR-FE engine carried into 2023 and 2024, so most kits physically fit those years too — always confirm the exact year and trim against the listing before ordering.
The aFe Hi-Tuck routes the pipe up and tight to the chassis to protect it off-road and clears KDSS.
Frequently Asked Questions
Does a cat-back exhaust add horsepower to a 4Runner 4.0L?
A cat-back exhaust adds only a modest amount of power to the naturally aspirated 1GR-FE — typically about 5 to 15 horsepower and a similar bump in torque, mostly in the mid-range. The factory 4Runner V6 makes 270 hp and 278 lb-ft, and a cat-back frees up some exhaust restriction, but the bigger benefits are a deeper sound, 10 to 20 lb of weight savings, and better corrosion resistance. For real power gains, pair the exhaust with an intake and a tune.
Is a cat-back exhaust legal in all 50 states?
Yes. A cat-back exhaust is 50-state street legal because it only replaces the piping behind the catalytic converters and leaves the factory emissions equipment untouched. It will not set a check-engine light or cause an emissions-test failure. Only systems that remove or modify the catalytic converters (cat-delete or test pipes) are not emissions legal.
What is the difference between T304, T409, and aluminized exhaust?
T304 is the most corrosion-resistant stainless steel and the best choice for salted winter roads or coastal humidity; it is non-magnetic and the slowest to rust. 409 stainless resists rust well and is a common OE-grade material but can show light surface oxidation over many years. Aluminized steel is the most affordable and holds up in warm, dry climates, but surface-rusts sooner once the coating is nicked or exposed to repeated road salt.
Will a 4Runner cat-back be too loud or drone on the highway?
Most 4Runner cat-backs are designed to avoid interior drone. The MBRP and Gibson systems deliver a deep tone that quiets down at cruising speed, making them comfortable for daily driving and road trips. The Borla S-Type is the loudest and most aggressive of this group, so it has more cabin presence on the highway — choose it only if you want a noticeably louder V6.
Does a cat-back exhaust fit a 4Runner with KDSS?
Some do, but you should confirm before buying because certain exhaust routings run close to the KDSS (Kinetic Dynamic Suspension System) plumbing found on TRD Off-Road and TRD Pro trims. The aFe Mach Force-XP Hi-Tuck specifically lists KDSS compatibility, which makes it a safe choice for those trucks. Always verify your exact trim against the product listing.
How long does it take to install a 4Runner cat-back exhaust?
A 4Runner cat-back exhaust takes most DIY installers about 45 to 90 minutes. Every system in this guide is a direct bolt-on that reuses the factory hangers and clamps behind the catalytic converters — no cutting or welding required. You will need basic hand tools, penetrating oil for the factory clamp bolts, and ideally a second person or a lift to support the system while setting the hangers.
Ready to Wake Up Your 4Runner's V6?
Shop every cat-back in this guide — plus hundreds more systems for trucks and SUVs — at NLP Performance.
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