Ultimate performance

Throttle bodies, manifolds and bespoke components — 100% custom parts, made in the UK.

0 components in catalog

0 stocked variants

0 stack configurations

0 custom parts, made in the UK

// 01 · The flagship

Complete ITB kits, engineered for your engine

Not a box of universal parts — a complete induction system: throttle bodies, manifold, stacks, linkage and filtration, sized from your displacement, head and target RPM. Designed as one system, because that's how the air sees it.

Throttle Body Kits

Bespoke ITB Kit — any engine

Your engine not on the list? We design and build complete individual throttle body systems for engines we have never seen before — that is where…

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Throttle Body Kits

Honda K20 Plug and Play ITB Kit

Carbon composite ITB kit for a standard K20 — fits every cylinder head, and bolts on without changing the top pulley.

from £1185.00

from £1422.00 inc. VAT

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Throttle Body Kits

Honda K20 Race/Kit car ITB Kit

Carbon composite ITB kit for a race or kit car K20. The manifold leaves the cylinder head unrestricted — the trade is modification to the front…

from £1185.00

from £1422.00 inc. VAT

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Throttle Body Kits

Peugeot 205 GTi6 Mi16 Plug and Play ITB Kit

Carbon composite ITB kit for the Peugeot 205 GTi6 (XU10J4RS) and Mi16 (XU9J4). Bolts straight on, 3.6kg complete.

from £1285.00

from £1542.00 inc. VAT

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Throttle Body Kits

Peugeot 306/405 GTi6 Mi16 Plug and Play ITB Kit

Carbon composite ITB kit for the Peugeot 306 GTi6 (XU10J4RS) and 405 Mi16 (XU9J4). Bolts straight on, 3.6kg complete.

from £1285.00

from £1542.00 inc. VAT

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Your platform not listed? Bespoke kits are core business — talk to us.

// 02 · Why GMR

The unfair advantages

∞design freedom

Internal geometry — without the tooling limits

Cast and machined components inherit the limits of their tooling. Our digital-first process doesn't. The flow path inside a GMR part is the one the engineer designed — not the one the tooling allowed. Compound curves, true radiused entries, section changes exactly where the airflow wants them.

0lighter than aluminium

Up to half the weight

Carbon composite construction delivers components up to 50% lighter than their aluminium equivalent. Less mass on the engine, less weight over the front axle — weighed, not claimed.

Carbon IDT technology — hollow carbon composite wall, 5,000× better insulation than aluminium

0better heat insulation than metal

Hollow carbon composite walls

Metal manifolds soak engine-bay heat straight into your intake charge. Carbon composite is up to 5,000× more effective at preventing heat transfer — the charge stays cooler and more consistent, and cooler air is denser air. That's power you keep on lap ten, not just lap one.

View the data: CF polymer vs aluminium under airflow →

DAYSnot months

Toolless manufacturing

Every component is built directly from its digital design — no casting patterns, no tooling spend, no minimum runs. Production takes days, not months. And because there's no re-tooling cost, genuine customisation for your engine is the default, not a premium.

// 03 · The point

Area under the curve

A headline peak figure is marketing. Area under the curve is performance.

Bore sizing matched to your displacement and target RPM. Stack lengths tuned for where you actually drive. Runner geometry the tooling can't veto. That's how you buy mid-range you can use at every apex — not a dyno screenshot.

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// 04 · Pedigree

From F1 to Superbikes

GMR's founder spent years engineering at the sharp end of motorsport — Formula 1, touring cars (WTCC, BTCC, TCR), the British Rally Championship, and World & British Superbikes (WSB, BSB) — where a part either performs under data scrutiny or it doesn't exist. These parts were never raced there; they're GMR's own designs, built to that same numbers-first discipline. Same engineer. Same standard. Your engine.

// 05 · In the wild