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Here at S.T.Motorsport we manufacture custom motorsport wiring harnesses, including stage rallying, road rallying, auto grass, national hotrod, hill climbs plus more.


We have gained knowledge of all aspects of motorsport wiring and formed good connections throughout the motorsport industry.  Having worked in different areas of motorsport it allows our aftermarket motorsport engine management looms and motorsport chassis wiring harnesses to evolve and develop in to systems that meet all of our customers requirement's keeping up to date with the latest motorsport electronics.

We have experienced most aspects of motorsport wiring systems, whether this is in the form of engine management looms or full motorsport chassis wiring harnesses. Due to our commitment and dedication any work that has been undertaken has proved successful. Customer satisfaction is important and the top priority for us is delivering a quality service that doesn’t cost the earth.

Custom Motorsport Chassis Wiring Harness Kits

We can manufacture a variety of custom motorsport chassis harness kits for different vehicle build projects. 

We provide two options for this.

Option 1 :- we can together design your custom chassis wiring harness kit via email with layouts and some discussion - We then Manufacture & Test - Ready to be posted out for install.

Option 2 :- We have your vehicle with us, we design - manufacture - test - install - commission & setup.

(Both options we are on hand over the phone/email for technical support after the kit has either been posted or your car has left us)

  • Fixed pricing 

For more information / pricing then please send us a email with some information about your project. We aim to reply within 48hrs.

 Aftermarket ECUs & Custom Engine Harnesses

99% of the time our motorsport engine wiring harnesses are custom manufactured to the customers specification to suit all aftermarket ECUs and engines.


  •  We email layouts over for you to alter, along with a few necessary bits of information,we can then start to manufacture your custom motorsport engine harness.

  • Engine harnesses can be posted out directly for install or have the option of bringing the car down to us for installation and setup.

  • We can supply a variety of ECUs with our custom engine harnesses as a package deal 

  • We are available over the phone/email for technical support with install.

  • Fixed Pricing

For more information / pricing then please send us a email with some information about your project. We aim to reply within 48hrs.



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