Mazda Miata 2003-2005 Haltech Nexus Wiring Harness
Boomslang plug and play wiring harness for Haltech Nexus

Vendor:Boomslang

Mazda Miata 2003-2005 Haltech Nexus Wiring Harness (BF29139)

SKU: BF29139-S3

$840.00
Shipping calculated at checkout.
From Shawn: Not sure this product is right for your build? Email me at service@tunedbyshawn.com before you order. I answer these myself.

ECUs always ship FREE with Tuned By Shawn!

Manufacturer Limited Warranty

Product details

Description

The Boomslang plug-and-play wiring harness BF29139 connects a Haltech Nexus R3, R5, S2, S3 or T2 to the factory engine harness on the 2003-2005 Mazda Miata (NB chassis, 1.8L BP VVT engine) with a manual transmission. It plugs in where the factory ECU connects, so there is no cutting, splicing or repinning, and the vehicle can be returned to stock at any time.

Vehicle Fitment

  • 2003-2005 Mazda Miata (manual transmission)

Boomslang part number: BF29139. Confirm your model year, engine and transmission before ordering. Similar-looking vehicles often use a different factory ECU connector or pinout and need a different harness.

Compatible Haltech ECUs

Choose the version that matches your ECU. Each version is built for that unit's connectors:

  • Haltech Nexus R3 VCU
  • Haltech Nexus R5 VCU
  • Haltech Nexus S2 ECU
  • Haltech Nexus S3 ECU
  • Haltech Nexus T2 ECU

Features

  • Vehicle-specific plug-and-play fitment for the 2003-2005 Mazda Miata
  • Plugs into the factory engine harness with no cutting, splicing or repinning
  • Factory harness is left untouched, so the install is fully reversible
  • OEM-style connectors and correct wire gauge throughout
  • Built in the USA by Boomslang

What's Included

  • 1x Boomslang plug-and-play wiring harness (BF29139) for the 2003-2005 Mazda Miata
  • Haltech ECU sold separately

Frequently Asked Questions

Does BF29139 require cutting the factory wiring?

No. The Boomslang harness plugs into the factory engine harness connectors, so the stock wiring stays intact and the vehicle can be returned to stock.

Which Haltech ECUs work with BF29139?

Haltech Nexus R3 VCU, Haltech Nexus R5 VCU, Haltech Nexus S2 ECU, Haltech Nexus S3 ECU, Haltech Nexus T2 ECU. Select the matching version when you order.

Does it need a tune after installation?

Yes. A Haltech standalone ECU must be calibrated for your engine and modifications before the vehicle is driven. Tuned By Shawn offers remote and in-person Haltech tuning. Email service@tunedbyshawn.com with any fitment questions before you order.

For off-road and competition use only. Not legal for use on pollution-controlled motor vehicles.