I suspect that a few people on here have fitted a six branch manifold like I am about to do. Now that I am going to get rid of the cat as the engine is in a mk2 I would like to know where is the best place to fit the lambda sensor? There are already two holes on the manifold for a probe (one hole for bank 1,3,5 & another for 2,4,6) but is it wise to fit it to one or should I get a hole done further down the pipe where all the gases meet?