When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Depends on management you are using. To use a Fiesta turbo management use the right one. To use a XR3i management use the left one. For after market management, use whatever you like. I use the left one with megasquirt, although the sensor is very slow.