PRL Motorsports for Honda Civic Type R FL5

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Intercoolers

PRL offers two core constructions in the same external dimensions - 28.35 x 4.3 x 7.25" billet intercoolers with billet machined aluminium end tanks, using the factory mounting points and bolts, rated to 600+ horsepower. Available in raw or black finish.

Bar-and-plate: traditional motorsport-grade construction with a dense core and high thermal mass - once cool, it stays cool through repeated hard pulls, with a slightly higher pressure drop under boost. PRL's testing on a stock-tune FL5 showed +8whp / +4wtq over OEM at approximately 15°C (59°F) ambient, with better consistency across back-to-back pulls.

Tube-and-fin: a newer construction with lower pressure drop and faster heat dissipation under stop-start conditions. Slightly less thermal mass, but recovers faster between pulls.

High Volume Intake (HVI) with secondary air duct

PRL identified the factory air duct and inlet as a measurable restriction above 400hp, so the FL5 HVI adds a secondary lower air duct drawing cool air from the guard well into the rotationally moulded HDPE airbox. Available in standard and carbon fibre versions, with a billet MAF housing choice:

• Street MAF housing: no tune required, maintains factory fuel trims and works with the stock ECU map.
• Race MAF housing: the largest MAF housing available for the platform, rated to 600+ horsepower with a 47% increase in airflow volume over the factory MAF. Requires a tune or recalibration to function correctly.

Turbocharger inlet pipes

The titanium inlet pipe replaces the restrictive factory inlet with a cast aluminium inlet transitioning to a titanium crossover pipe - gasket-matched 64mm ID at the compressor inlet, opening to 80mm OD / 78mm ID through the crossover, for over 50% more airflow than the factory inlet. Also offered in black thermal-coated titanium and matte carbon fibre (full kit or pipe only), with a billet inlet pipe heat sink available. Compatible only with the PRL HVI intake (the factory airbox is not compatible) and fits all factory-fitment turbochargers.

Charge pipes and silicone hoses

The charge pipe upgrade kit uses a smooth-flowing, larger diameter cold side with 4-ply silicone couplers chosen for low thermal heat transfer and resistance to expansion under boost, with a factory-diameter hot-side outlet to maintain quick turbocharger spool. No tune required, and compatible with the OEM intercooler or any PRL intercooler. Silicone intake hose kits are offered for the factory intake and for the High Volume Intake.

Exhaust

The 3" front pipe and race downpipe replace the factory pipework at factory mounting points and pair with stock or aftermarket catbacks. Race downpipes are intended for race and motorsport use only - confirm legality in your state before ordering.

P700 drop-in turbocharger upgrade

PRL describes the P700 as the most powerful drop-in turbocharger available for the K20C1, supporting over 600 horsepower without compromising spool time. It uses a High Efficiency compressor wheel taller than typical billet upgrades, a tapered tip exducer and cutback blade design, plus a High Efficiency turbine wheel and larger wastegate actuator bore to reduce backpressure. PRL's FL5 development cars running the P700 with full supporting modifications (HVI, intercooler, titanium inlet, charge pipes, downpipe, front pipe, XDI HPFP, methanol injection, Hondata FlashPro) have produced 528+ horsepower and 431+ ft/lbs of torque on testing dynos.

Chassis and driveline

The billet rear engine mount uses an I-beam billet 6061 aluminium structure with dual press-fit 60A EPDM bushings. EPDM is an OEM-grade material chosen for its resistance to heat, weather, solvents and tearing, and unlike urethane it does not break down, deform or transmit harsh vibration - reducing engine movement under load without the NVH penalty typical of aftermarket mounts. Bushing shells and inserts are zinc-coated to resist corrosion. Also available: the subframe reinforcement system collar kit, "Throwback" rear strut bar, stainless steel braided clutch line, baffled coolant expansion tank and drop-in high flow panel air filter.

Chassis code: the current Civic Type R is the FL5 (2023+), powered by an evolved K20C1 with revised cooling, a larger factory intercooler and a refined turbocharger. The previous generation is the FK8 (2017-2021). PRL engineers FL5 parts specifically for this chassis rather than adapting FK8 parts, so check the chassis code in the product title before ordering - a small number of items, such as the baffled coolant expansion tank, are listed as suiting both FK8 and FL5.

Intercooler core: both the bar-and-plate and tube-and-fin intercoolers share the same 28.35 x 4.3 x 7.25" external dimensions and 600+ horsepower rating. Bar-and-plate suits extended track driving, long pulls and hot climates; tube-and-fin suits mostly street driving, short pulls and the fastest recovery between launches.

MAF housing: choose the Street MAF housing for untuned bolt-on builds, or the Race MAF housing if you are running or planning a tune such as Hondata FlashPro or KTuner.

Intake compatibility: the titanium and carbon fibre turbocharger inlet pipes require the PRL HVI intake and are not compatible with the factory airbox. A HVI and titanium inlet bundle is available.

Build order: many owners start with an intercooler, HVI (Street MAF) and charge pipes with no tune; add the front pipe, downpipe, a tune and the Race MAF housing next; then the titanium inlet pipe and billet rear engine mount; with the P700 turbocharger, supporting fuel system and a professional tune as the final stage.

PRL Motorsports FL5 parts are designed as direct replacements using factory mounting points, hardware and sensor locations, and fit right-hand-drive models without modification. Installation by a professional is recommended - several items require removal of the front bumper, intake system or exhaust pipework, and some require the vehicle to be safely raised and supported.

Plan for the supporting items your chosen parts need: the Race MAF housing and race downpipe require a tune or recalibration; the titanium and carbon fibre inlet pipes require the PRL HVI intake; and the P700 turbocharger requires full supporting modifications including fuel system upgrades and a professional tune. Always follow the manufacturer's instructions, torque specifications and break-in or re-check intervals, and confirm road legality in your state before fitting race-use components.

Do PRL Motorsports FL5 parts fit right-hand-drive Australian cars?

Yes. PRL engineers each product specifically for the FL5 chassis and K20C1 engine, and all FL5 PRL parts fit right-hand-drive international models without modification.

Should I choose the bar-and-plate or tube-and-fin intercooler?

Both share the same external dimensions, factory mounting points and 600+ horsepower rating. Bar-and-plate has greater thermal mass and suits extended track driving and hot climates; tube-and-fin has lower pressure drop and recovers heat faster between pulls, suiting mostly street use.

Do I need a tune for the High Volume Intake?

The Street MAF housing requires no tune and maintains factory fuel trims. The Race MAF housing flows 47% more air than the factory MAF and requires a tune or recalibration to function correctly.

Can I fit the titanium turbocharger inlet pipe to the factory airbox?

No. The titanium and carbon fibre inlet pipes are only compatible with the PRL High Volume Intake; the factory airbox is not compatible. They fit all factory-fitment turbochargers.