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Race headers

Based upon the North American ‘NISMO’ header, which was originally conceived to fit left-hand-drive* S30s in the absence of suitable parts from Japan (RHD and S20 powered cars), Zstory has redesigned and improved it to fit all left-hand drive* models.

Zstory has continually strived to evolve the manifold to fulfill modern-day customer demands ; it is made from 201 (austenitic)1.25mm stainless-steel for its own protection and longevity, with less pipe welds and a thicker flange specifically trimmed to fit all heads and blocks.

The 6-2 configuration is generally accepted as being the most suitable for the widest range of engine applications. Zstory has further developed that conception with the 2-1 joining as far back as possible before the first silencer.

The Y-pipe (2-1) collector has a built-in lambda sensor plug and bung to allow accurate engine testing and real-time surveillance and finishes with a V-band clamp fitting for leak-free and easy mounting/disassembly.

The manifold itself has equal-length primary pipes with an internal diameter of 40mm. It is important to stress the internal diameter of the pipes because the earlier, cast-iron versions were measured externally and had thicker piping!

Tech
infos

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Originating in competition and now also meeting the demands from the growing popularity of stroker and prepared street/road engines, typical uses of this manifold are:

– Circuit and other competition prepared L26s and L28s,
– Wild-street / fast-road L28s and mild strokers.[/sstoggle]

The mid-bore, primary and secondary pipes evacuate the exhaust gases and particles with a high-flow velocity rate which permits a quick throttle response and good torque throughout the low-to-mid power-band range which is essentiel for the small to mid engine sizes.

The equal-length primary pipes matched to a long 2-1 collector pipe, recreate a correct back-pressure (or scavenging effect**) to ensure an excellent exhaust flow but also an efficient inlet performance!

Seperate pipe-work to allow partial dismantling for:
– easier initial fitting,
– easier servicing under the car – clutch, gearbox and differential,
– the replacement of any pipework due to accident damage, especially competition and lowered-street cars,
– less expensive expedition to clients as packing is more compact.

⇒ Solid T-bolt and V-band clamps for a secure and leak-proof exhaust line.
⇒ A thick flange for the fitting with all inlet manifold types.
⇒ Stainless-steel ensures a long life – fit and forget!
⇒ Complete kit – all included for home fitting.

Equal-length 6-2 primary pipes and rectangular ports.
⇒ The flange thickness is 15mm
⇒ The height of the manifold ports is 38mm
⇒ The width of the two inner ports is 35mm
⇒ The width of the 4x outer ports is 29mm
⇒ Primary pipes (42mm internal diameter) leading to 2x equal length secondary pipes of 60mm internal diameter each.
⇒ Single secondary end-pipe of 63mm fits directly onto the common exhaust line of 63mm (2.5’’).
⇒ Primary pipes = 920mm long, joining of each 3-1 at 700mm
⇒ Secondary pipe = two lengths of 680mm and 500mm
⇒ Overall length from engine head to single exhaust pipe = 1m40cm

It works with each and with twin SU use has been successful using either the standard 1 ¾’’ 240Z carbs and the big-bore (Jaguar/Rover) 2’’ versions.

Generally, it fits easier with the better quality triple inlet manifolds.

Bigger-bore primary pipes and exhaust line bore are not necessarily better – a manifold and line ought to be ‘tuned’ to your engine’s needs.

*this manifold is therefore won suitable for LH and RH drive S30s.
**read more of that later in the specific section on this website!

I recommend that you consult with me before deciding – what are your expectations and why I have 3x versions to choose from!