Exhaust Headers

• Equal-length headers for an even exhaust pulse that typically shifts power up the rev range
• Unequal-length headers that keep the familiar flat-four character on Subaru and Toyota 86 / BRZ engines
• Twin scroll headers for Subaru turbo applications
• Exhaust manifolds, including cast, 2-into-1 and turbo designs, for Toyota, Subaru, Mitsubishi, Nissan and Honda engines
• Turbo up-pipes in 2-bolt and 3-bolt designs for Subaru EJ20 and EJ25 engines
• Exhaust Accessories for gaskets, hangers, clamps and hardware

To build out the rest of the system:

• Downpipes for turbo cars running a matched front section
• Sports Cats to keep flow up while staying road compliant
• Cat-Back Exhausts to finish the system behind the catalyst
• Turbo-Back Exhausts for a complete turbo car system
• Mid Pipes and Mufflers to adjust volume and drone
• De-Cat Pipes, for race and motorsport use only

Fitment is specific to the model and engine. Match the engine code and chassis code in the listing to your car before ordering. Platforms covered in this range include:

• Subaru WRX and WRX STI (GD, GG, GE, GH, GR, GV, VA, VAG, VBH, VNH), Liberty GT, Forester XT (including SJG) and Outback MY22–26
• Toyota 86 and Subaru BRZ (ZN6/ZC6, FA20), plus separate options for the Toyota GR86 and Subaru BRZ from 2022
• Mitsubishi Lancer Evolution IV–IX (CN9A/CP9A/CT9A, 4G63)
• Nissan Skyline GT-R (BNR32/BCNR33/BNR34, RB26DETT), Nissan 350Z (Z33, VQ35DE) and Nissan 240Z (S30/HS30)
• Honda Civic Type R (FD2)

Runner design matters more than the material. Equal-length headers give an even firing pulse and typically suit a revvy engine. Unequal-length and 4-2-1 designs tend to favour low and mid-range response, which is friendlier for daily driving. On a turbo car, the manifold needs to get hot gas to the turbine with as little heat loss and restriction as possible, so wall thickness, flange strength and bracing matter as much as bend radius.

Check these identifiers before ordering:

• Up-pipe flange: Subaru up-pipes come in 2-bolt and 3-bolt designs, so match the bolt pattern at your turbo inlet.
• Single or twin scroll: match the header to your turbo type.
• Pipe size: sizes are listed where the manufacturer provides them, such as 1.625in primaries or 2in / 51mm up-pipes.
• Model year and market: Australian-delivered cars sometimes have different manifolds, heat shielding and oxygen sensor placement from JDM equivalents.
• O2 sensor bungs: confirm the number and thread your car needs. A missing bung means a workaround or an engine warning light.

Be realistic about gains. On a stock engine, headers alone usually give a modest power increase, with a noticeable change in throttle response and exhaust note. The bigger returns come when the header is matched to the rest of the exhaust and the car is tuned.

Installation by a professional is recommended. The job usually means raising the car safely and removing the old manifold and heat shields. New gaskets, studs and nuts should be used on reassembly. Seized and snapped exhaust studs are a common delay on older cars, so allow for penetrating fluid and stud extraction. Torque the flange evenly and re-torque after a few heat cycles.

Some headers relocate or delete the factory catalyst. Catless and de-cat sections are for race and motorsport use only and are not legal for road use in Australia. If the car is registered and driven on the road, keep a compliant catalytic converter in the system.

Plan for tuning. Any header that changes sensor position or exhaust flow enough to alter fuelling should be followed by a tune from a qualified workshop.

Will a header fit my exact car?
Only if the listing names your engine code and chassis. Check O2 sensor count and placement too, since Australian-delivered models can differ from imports.

Do headers need a tune?
On most cars, yes, both to get the full benefit and to keep fuelling safe. A tune from a qualified workshop is the safer path.

Are headers legal for road use in Australia?
A header that keeps the factory catalytic converter position is generally the safer option for a registered car. Catless designs are for race and motorsport use only. Check your state's requirements.

What else do I need to order?
New gaskets, studs and nuts at minimum. Some builds also need O2 sensor extensions or a matched downpipe.