This is a custom module that allows you to use ANY battery in your McLaren without having to pay for the very expensive OEM Lithium battery that costs thousands of dollars and are very hard to find in stock most of the time.   

Bolt on application. 2 wire hook up and 1 connector that plus into them OEM battery harness. 

No coding etc required. 

UPON CHECK OUT PLEASE STATE MCLAREN YEAR AND MODEL