The Acura TL Type S remains a benchmark for front-wheel-drive performance sedans, blending Honda’s legendary engineering with luxury appointments and a potent V6 engine. For enthusiasts looking to extract maximum power, a structured upgrade path is essential. This guide covers every step from initial intake improvements to full forced induction, ensuring you build a reliable, high-horsepower machine without sacrificing drivability.

Starting with the Basics: Intake Upgrades

The foundation of any performance build is improving the engine’s ability to breathe. The factory intake system on the TL Type S is restrictive, designed for quiet operation and emissions compliance rather than airflow. Upgrading the intake is the simplest and most cost-effective way to unlock horsepower and throttle response.

Begin with a drop-in high-flow panel filter from K&N or AEM. This swap alone can reduce intake restriction by up to 20% and is a five-minute install. For greater gains, install a full cold air intake system. Products like the AEM Cold Air Intake or the Injen SP Series relocate the filter into the front bumper area, pulling cool, dense air from outside the engine bay. This yields gains of −5–10 wheel horsepower on a stock engine.

If you prefer a short ram intake, options from Weapon-R or DC Sports offer quicker throttle response and a more aggressive intake sound, but they draw warmer underhood air. For a daily driver, a short ram is acceptable; for track use, a full cold air intake is superior. Pair your intake with a throttle body spacer (e.g., from Heeltoe Auto) to further smooth airflow and reduce turbulence before it enters the plenum.

  • High-flow panel filter: K&N 33-2410, washable and reusable, adds 3–5 hp.
  • Cold air intake: AEM 21-428P, includes heat shield and MAF adapter, gains 8–12 hp.
  • Short ram intake: Injen SP1075P, polished tube with reusable filter, gains 6–9 hp with sharper throttle.

Exhaust Upgrades: Letting It Breathe

An engine that can inhale freely must also exhale without restriction. The factory exhaust system on the TL Type S is heavily baffled, with multiple resonators and a restrictive muffler. After upgrading the intake, addressing the exhaust path will unlock additional power and improve the engine’s efficiency.

The most impactful upgrade is a cat-back exhaust system. Systems from RV6, Greddy, or HKS replace the piping from the catalytic converters rearward, reducing backpressure and improving exhaust scavenging. Expect 10–15 wheel horsepower gains with a deeper exhaust note. Choose a 2.5-inch diameter for moderate power; 3-inch if you plan forced induction later.

For maximum flow, install high-performance headers. The stock exhaust manifolds are cast iron and restrictive. Aftermarket headers from RV6, J-Pipe, or Megan Racing equalize exhaust pulses and reduce backpressure at the source. Pair them with a high-flow catalytic converter (e.g., Random Technology or GESi) to maintain emissions compliance while improving flow.

Consider an exhaust cutout for track days or tuning sessions. A cutout before the muffler allows you to bypass the entire exhaust system at the flip of a switch, ideal for dyno tuning or maximum power runs. For street use, keep the full system for noise compliance.

  • Header: RV6 J-Pipe with V-Band outlet, reduces backpressure by 30%, gains 12–18 hp when tuned.
  • Cat-back exhaust: Greddy SP2, 2.5-inch stainless, deep tone, 8–12 hp gain.
  • High-flow cat: Random Technology 200-cell, reduces restriction by 40% over stock.

Tuning Your Acura TL Type S

Intake and exhaust upgrades create the potential for horsepower, but without proper tuning, the gains will be limited. The factory ECU is programmed for emissions and reliability, not performance. A custom tune adjusts air-fuel ratios, ignition timing, and VTC (Variable Timing Control) to exploit the improved airflow.

The most popular tuning solution for the J32 and J35 V6 in the TL Type S is Hondata FlashPro. This device connects to the OBD-II port and lets you upload pre-loaded or custom calibrations. Combined with a wideband oxygen sensor, you can dial in the perfect air-fuel ratio (around 12.8:1 under boost for safety, 13.0:1 naturally aspirated).

If you're building a high-horsepower forced induction car, invest in a dyno tune from a reputable shop. VitViper and E-Tunez are well-known for remote tuning with FlashPro. For naturally aspirated builds, many off-the-shelf FlashPro basemaps from Hondata work with common bolt-on parts.

During tuning, pay close attention to knock control and ignition timing. The J35 engine has a high compression ratio (11.0:1 in some years), which can be knock-sensitive. Lowering compression with thicker head gaskets or using the RL manifold gasket is common for boost, but for a naturally aspirated build, keep timing conservative and use high-octane fuel (91 or 93 RON).

  • FlashPro device: Hondata 160-120, allows real-time datalogging and calibration uploads.
  • Wideband O2 sensor: AEM 30-0300, essential for safe tuning at high power levels.
  • Remote tuning: Services like E-Tunez offer custom basemaps delivered within 24 hours.

Forced Induction: Turbocharging or Supercharging

For enthusiasts seeking killer power, forced induction is the endgame. The TL Type S responds well to both turbocharging and supercharging, but each approach has different characteristics, costs, and supporting requirements.

Turbocharging offers the highest peak power potential. A well-chosen turbo like the Precision 6266 or Garrett GT3076R can support 500–600 wheel horsepower on a built engine. The downside is more complexity: you need a turbo manifold, oil feed/drain lines, intercooler, blow-off valve, wastegate, and engine management to control boost. Turbo kits for the TL Type S are available from Full-Race (custom), SpoolinPerformance, or you can piece together a kit with parts from Vibrant Performance and Tial.

Supercharging provides instant throttle response and a linear power curve. The CT Engineering (now Magnaflow?) supercharger kit was once available, but now you may need to source a used kit or go custom. The Eaton M62 or TVS1320 roots-type blowers fit well on the J35. Supercharging retains the factory exhaust manifold, simplifying installation, but the heat management is critical. Expect 400–450 wheel horsepower on a stock bottom end with proper fueling and tuning.

For either route, the engine must be prepared. Install ARP head studs to prevent head lift, upgrade the fuel injectors (ID1050X or Bosch 550cc minimum), and install a Walbro 255 lph fuel pump. The factory clutch will fail quickly on a boosted TL; upgrade to a Competition Clutch Stage 4 or ACT Heavy Duty to handle 400+ ft-lbs.

  • Turbo kit (custom): Precision 6466 turbo, Full-Race cast manifold, Tial 44mm wastegate, 3-inch intercooler piping – supports 500+ hp.
  • Supercharger (used): CT Engineering kit, includes Eaton M62, custom bracket, pulley, and belt – rare but effective.
  • Supporting fuel system: Walbro 255 pump, ID1050X injectors, adjustable fuel pressure regulator.
  • Head studs: ARP 234-4301, 200,000 psi tensile strength, prevents head gasket failure under boost.

Supporting Modifications for Reliability

Adding 50–100% more horsepower demands corresponding reliability upgrades. The TL Type S chassis and drivetrain are robust, but weak points include the transmission, clutch, cooling system, and engine internals at high boost levels.

Start with cooling. A high-capacity aluminum radiator from Koyo or Mishimoto drops coolant temperatures by 15–20°. Add a thermostatic oil cooler (Setrab or Earl’s) to keep engine oil below 230°F during hard driving. For forced induction, an air-to-water intercooler or a large front-mount bar-and-plate intercooler with a high-flow fan is mandatory.

The transmission (6-speed manual or automatic) must not be ignored. The manual transmission from the TL has a known synchro issue; upgrade to carbon synchros from Synchrotech or Carillo. For automatics, install a high-stall torque converter (3100–3400 stall) and a valve body upgrade from Paragon or Alto. A limited-slip differential (MFactory helical) improves traction and reduces torque steer.

Finally, consider suspension upgrades to handle the extra horsepower. Stiffer springs (KW V3 coilovers) and larger sway bars (Progress or Eibach) keep the car planted. Upgraded brake pads (EBC Yellowstuff or Hawk HP+) and brake ducts prevent fade when pushing the power. Do not overlook motor mounts; Innovative mounts reduce engine movement, preventing exhaust leaks and minimizing axle bind.

  • Radiator: Koyo A3166, triple-pass core, 35% more cooling capacity.
  • Oil cooler: Setrab 19-row with thermostatic plate, maintains oil temp at 200–210°F.
  • Clutch: Competition Clutch Stage 4 sprung 6-puck, rated for 460 ft-lbs.
  • Limited-slip diff: MFactory helical LSD, reduces wheel hop and improves corner exit speed.
  • Coilovers: KW V3, adjustable rebound and compression, perfect for street and track.

Conclusion: A Balanced Approach to Performance

Building a high-horsepower Acura TL Type S requires patience, planning, and the right sequence of upgrades. Start with intake and exhaust to establish a solid foundation, then dial in the tune to maximize naturally aspirated gains. When you're ready, forced induction—whether turbo or supercharger—unlocks the engine’s full potential, but only with proper supporting modifications for fueling, cooling, transmission, and chassis.

Remember, reliability is just as important as raw power. The TL Type S is a robust platform, but pushing beyond 450 wheel horsepower requires serious investment in internal engine components (forged rods, pistons, and head studs). For most enthusiasts, a well-tuned 380–420 wheel horsepower car with bolt-ons and a conservative tune provides a thrilling daily driver that can still embarrass many modern sports cars.

For further reading, check out build threads on AcuraZine and parts from Heeltoe Auto. With the right path, your TL Type S can become a true performance legend.