TB1 Jenvey Throttle Body Kit for Mazda MX-5 NA NB

TB1 Jenvey Throttle Body Kit for Mazda MX-5 NA NB

We have taken the legendary Jenvey throttle body kit and refined it to work even better on the MX-5 platform. Firstly, we have included the beautifully engineered SPS Motorsport Idle Air Control Valve to ensure OEM idle quality can be achieved with appropriate tuning. The idle air control valve has an integrated vacuum manifold which allows vacuum-assisted brakes to be retained, making driving a pleasure.

Then, we have specified an under throttle body linkage kit, instead of the usual over body kit. Not only does moving the linkage under the throttle bodies clean up the look in the engine bay, but it also prevents the throttle cable from fouling the valve cover or touching the timing belt on cut covers. We install the linkage facing towards the front of the car to give the largest radius for the throttle cable to run around, which keeps the pedal feeling snappy and light.

Brand new Bosch 330cc injectors are fed via a two-piece billet aluminium fuel rail for all kits. Our own fuel pressure regulator adapter kit allows the standard fuel pressure regulator or damper to be installed, retaining the OEM fuel system. Where 1.8s have the injectors in the head, we supply 4 stainless steel core plugs to seal the unused ports.

Previously, installing the filter was extremely difficult. The air filter has been swapped from a sausage style to a pair of Ramair twin socks to greatly improve fitment around the clutch master cylinder on RHD cars. The air filters have been specified to leave ample space above the end of the 50mm long air horn and leave enough clearance to the proportioning valve on NB 1.8s. Our air horns are also slightly narrower at the end of the bell mouth to prevent them from clashing between cylinders 2 and 3 on 1.6s.

We’ve even gone to the lengths of sourcing a replacement throttle cable with a ball end to ensure that fitment is just like OEM. The cable usually supplied by Jenvey is a typical barrel type, and not compatible with a standard pedal. On top of that, we’ve pre-tapped the manifold to G 1/8 to accept the idle air control valve fittings. We wanted to guarantee that this Jenvey setup is the best, most complete individual throttle body kit on the market, bar none.

Kit Contains

  • 4 x Jenvey throttle bodies
  • 4 x 50mm long air horns
  • Cast intake manifold with G 1/8 threads pre-tapped for idle air control ports
  • Two-piece billet aluminium fuel rail
  • Bosch 330cc EV14 injectors
  • Fuel pressure regulator adapter kit
  • 8mm fuel hose 1 metre
  • TPS sensor & plug
  • Under throttle body linkage kit
  • Ramair twin air filters
  • SPS Motorsport Idle Air Control Valve
  • IAT sensor harness (Except 1.8 VVT)
  • 4 x Injector bungs (1.8 only)
  • Standalone ECU

*Trumpets shown in the engine bay photo differ from included air horns

Additional information


Jenvey Dynamics


Mk1 (89-98), Mk2 (98-05)

Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.