DRAG TO ROTATE · SCROLL TO ZOOM · THE MODEL FOLLOWS YOUR CONFIGURATION
Throttle Body Kits
Honda K20 Race/Kit car ITB Kit
from £1185.00
from £1422.00 inc. VAT
MADE TO ORDER
Built in approx 15 working days
Delivered in around 18 working days — about Mon 9 Nov if ordered today
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 pulley, water pump and alternator.
GMR recommends
Not sure? Start from a build we’d specify, then change anything
you like.
Want this, but not quite like this?
A different size, a bore spacing we don’t list, a port shape to
suit your head, a fitting somewhere else — we make these ourselves, so most of it is
a drawing change rather than a new product. Tell us what you need and we’ll price it.
What’s included
The base price is a complete bolt-on induction system. The options above only add what is listed against them — nothing in this list is an extra.
In the base price
Carbon composite K20 short intake manifold, set to the K20 intake port angle
K20 TPS adaptor kit, which carries the sensor already on your engine
Airbox bossed for the OEM air intake temperature sensor — it takes the sensor already on your engine
Mounting hardware to fit the manifold to the cylinder head
Not in the base price
A throttle position sensor — the base kit adapts the one already on your engine. Choose GMR TPS sensor and adapter above for a complete assembly with its own sensor.
Injectors, fuel rail and injector blanks — choose these above
K20 vacuum manifold kit — an option above
Idle valve, MAP sensor and air temperature sensor
Injector fitment
The OEM injector ports in this kit are designed for Honda injectors — choose OEM location if you are keeping the injectors and fuel rail already on your engine.
Injectors supplied by us sit in the throttle body location and need our fuel rail, which is included in the price of either injector option. They cannot be fitted in the OEM location.
Advanced Carbon Composite ITB kit
Manufactured using Carbon IDT, (Carbon Infused Digital Technology), high-strength carbon composite, this intake system kit is super lightweight and exceptionally insulative.
Our Honda K20 kit requires no disassembly of our kit before bolting onto the engine. (Removal of the air filter is required to synchronise the throttle bodies).
Why Our ITB kits Lead the Way
Optimised Geometry, Perfect Fit
No porting is required – we give you the option to choose throttle body size and intake port geometry. We will even make it to suit your ported cylinder head geometry, just send your traced port outline to match, saving you hours of port matching and cost to do so.
Optimum angle
This kit is setup to copy the intake port angle of the K20 head for perfect airflow transition.
A throttle smooth as butter
Our throttle quadrant system delivers smooth, precise throttle progression compared with conventional tie-rod and ball-joint arrangements. The design is simpler, more reliable, and reduces the likelihood of mechanical issues.
Vacuum and idle ports
If selected at purchase, each kit includes predrilled and tapped vacuum ports.
Additional to this we can provide a vacuum/map/idle manifold to use all of the K20 original sensors to retain the management you use currently.
O-Ring head sealing
O-ring seals are utilised to seal the intake manifold to the cylinder head and are maintenance free. This much improved sealing technique reduces liklihood of sealing failure.
Motorsport Grade filtration
All of our air boxes come with a replaceable high quality, twin layer, fully reticulated and polymer-impregnated foam designed for maximum dust filtration, high airflow, and long-term performance which also filters the idle/vacuum manifold. The air box is bossed to take the engine’s own air intake temperature sensor.
Hollow Carbon Composite Construction
Unlike aluminium, our intake manifolds, air boxes and velocity stacks are naturally insulating. In fact, they are up to 5,000 times more effective at preventing heat transfer than metal. This keeps intake air cooler, reduces heat soak, and delivers more consistent power.
Ultra-Lightweight
With an incredible weight saving over aluminium, our ITB kits, increase power, reduce air intake temperature, improve throttle response, and reduce overall vehicle mass. Full assembly weight of 3kg including fasteners!
Because this inlet manifold comes directly out of the cylinder head, some modifications to the front belt pulley/water pump and alternator will be required to allow this to have the direct unrestricted entry it is designed for.
Choosing your options
Every option and its price is on the configurator above. This is the reasoning behind each choice.
Throttle size
48mm or 50mm – sized to your displacement and the rpm you actually use. Bigger is not quicker: oversizing costs you drivability for airflow you cannot reach.
Cylinder head intake port
Standard – for an unmodified K20 head
Custom – port matched to your own head from a traced outline. Chargeable, and the manufacturing lead time starts when you approve the design rather than at the order date.
Injector ports
OEM location – keeps the Honda injectors and fuel rail already on your engine
Without OEM location – no ports in the manifold
Injectors
Nothing required – bodies with no injector provision at all
Blanked injector holes – bosses blanked off, for keeping the injectors already on your engine
Green Giant 465cc or Bosch 550cc – supplied with our fuel rail and fitted in the throttle body location. They do not fit the OEM ports, which are sized for Honda injectors.
Vacuum
Without vacuum ports – nothing drilled or tapped
Vacuum ports and 6mm barbs – four ports for balancing and your own vacuum setup
Vacuum ports and K20 vacuum manifold kit – runs the original K20 sensors so you keep the management you have
Throttle position sensor
K20 TPS adaptor kit – carries the sensor already on your engine
GMR TPS sensor and adapter – a complete assembly, sensor included
Know when your engine is covered
We develop induction kits one engine at a time — Honda K20 and Peugeot GTi6/Mi16 so far, with more in build and a bespoke route for anything else. Subscribe and we will tell you when a kit lands for yours, and send the sizing and fitment guides we write along the way.
