Stoney Racing MX5NB-0014 Silicone Coolant & Breather Hose Kit – Mazda MX5 MK2/MK2.5 NB 1.8

The Stoney Racing MX5NB-0014 is a silicone replacement for the coolant and breather hoses on the Mazda MX5 MK2/MK2.5 NB 1.8, 1998–2005.

The kit replaces 11 hose positions in the engine bay, covering the radiator, heater matrix, thermostat, throttle body, oil cooler, expansion tank and breather system. It contains 13 hoses, because the thermostat bypass and PCV breather hoses are supplied in both MK2 and MK2.5 versions. Each hose is built from 4-ply silicone with 3-ply polyester reinforcement, so it will not perish, swell or crack like ageing rubber hoses.

It is available in 9 colours and can be ordered with a full set of stainless worm-drive, spring or stainless T-bolt clamps, or without clamps if you plan to reuse your originals.

Key Features

• Direct-fit replacement for 13 coolant and breather hoses
• Fits all Mazda MX5 MK2 and MK2.5 NB 1.8 models, 1998–2005
• Manual and automatic, RHD and LHD
• 4-ply silicone with 3-ply polyester reinforcement
• Working pressure over 7 bar, burst pressure over 10 bar
• Temperature range −50°C to 180°C
• Choice of 9 colours
• Optional full clamp kit in 3 styles
• 3-year manufacturer warranty

Specifications

Hoses Included

• Upper radiator inlet hose
• Lower radiator outlet hose
• Heater matrix inlet hose
• Heater matrix outlet hose
• Thermostat bypass coolant hose (MK2)
• Thermostat bypass coolant hose (MK2.5)
• Thermostat housing to throttle body coolant hose
• Cam cover to air intake breather hose
• PCV valve to inlet manifold breather hose (MK2)
• PCV valve to inlet manifold breather hose (MK2.5)
• Oil cooler inlet hose
• Oil cooler outlet hose
• Radiator to expansion tank hose

Clamp Options

Black Spring Clips are the type most manufacturers use. They give the most even clamping pressure and are generally the best choice for coolant hoses, although being mild steel they can show surface rust over time.

Stainless Worm-Drive clamps are fully stainless, so they will not rust, and they are easier to fit in tight spaces. A good choice if engine bay appearance matters.

Stainless T-Bolt clamps are the heaviest-duty option, ideal where maximum clamping force is wanted.

None lets you reuse your existing clamps. These hoses are slightly thicker than standard, so some original clamps may be too small.

Important Fitting Information

• Some coolants are not compatible with silicone hoses. Check your coolant before fitting.
• Two versions of the thermostat bypass hose and PCV breather hose are supplied. Use the MK2 versions on 1998–2000 cars and the MK2.5 versions on 2001–2005 facelift cars; the spare pair is not needed.
• Use washing-up liquid or a silicone-based lubricant when fitting. Do not use oil-based lubricants.

What's in the Box?

• 13 × Stoney Racing reinforced silicone hoses in your chosen colour
• Full clamp set in your chosen style (if selected)

Frequently Asked Questions

Does it fit both the MK2 and MK2.5?

Yes. The MX5NB-0014 includes both versions of the two hoses that changed at the facelift, so it fits every NB 1.8 BP-Z3.

Why are there 13 hoses for 11 positions?

Two hoses differ between the MK2 and MK2.5. Both versions are included so the kit fits either model, and you will have two left over.

Does it fit automatic and left-hand-drive cars?

Yes. It fits manual and automatic models in both RHD and LHD.

Which clamps should I choose?

Spring clips give the most even clamping force for coolant hoses. Stainless worm-drive clamps will not rust and are easier to fit. T-bolt clamps are the strongest option.

Can I reuse my original clamps?

Often, yes. However, these hoses are slightly thicker than the originals, so some factory clamps may be too small.

Is my coolant compatible?

Most coolants are fine, but some types are not compatible with silicone. Check your coolant before fitting.

What warranty do I get?

Stoney Racing silicone hoses carry a 3-year warranty.