No I didn't find out what the AFR was as the lambda sensor they were using would fit up the tail pipe. As I have a techcraft silencer which has a 90 degree bend on the tail pipe, as the block is in a kitcar (Quantum Xtreme). But I will be fitting a weld on boss to house the lambda sensor for the next RR. Would a T34 be a bit laggy? Or would a hybrid T3 be more suitable. The car is pretty rapid as it only weighs 720Kg.