Installing a Synergy2 Ronbox Diesel Tuning Box u0026 New MAF sensor Freelander TD412 years ago we launched the Synergy 2a (aka Ronbox 2a) which uses a low power state of the art microcontroller to boost overall performance and also to compensate for maf sensor deterioration and allow a low cost, more reliable maf to be used to ensure optimum performance from below 1500rpm.