M-Tuned Billet Dual Feed Fuel Rail

94-05 MX5 NA8 NB8  1.8 1800cc BP series engine

Perfect for engine swaps, returnless to return type fuel conversions

High flow dual feed fuel rail. The stock fuel rail has a tiny 3/16" bore and asymmetrical internal that will not provide even fuel distribution. This can lead to lean spots in the fuel curve. Those lean spots require the tuner to add extra fuel and reduce timing, reducing power output.  The smaller internal diameter of the OEM rail also does a poor job of damping the large pressure wave generated by the opening of oversize injectors. The M-Tuned dual feed rail has a massive .500" / 12.7mm bore and completely symmetrical internal design. This increased flow and better pulsation damping allow the tuner to pull fuel out of the curve and add timing.

The kit includes a brass adapter to allow you to run either the factory fuel pressure regulator or aftermarket adjustable fuel pressure regulator, AFPR not included. Hose kit available separately.

This is the largest bore direct fit fuel rail ever offered for the Miata.
 

• Fits 94-05 Mazda Miata BP05, BP4W, BP6D head casting only
• .500" bore
• 3/8" NPT female threaded ends
• Billet 6061-T6
• Precision CNC machined
• CNC machined brass FPR adapter
• Includes mounting bolts