Originally Posted by
thejudge
Hi Neal, Ive just bought an unused Clocked Plus 4 21-4BTT from a racer here in Aus. I'm going to use it in my mbx6r (I know I should update it, but it's dialled). I know that 9886 and 41001 is the best combo for the engine but I'm going to need a pipe that's on the ifmar homologation list. What's the next best combo to use?
I have the 41029 short manifold as it has the tighter bend suiting the mbx6r and also a 9901 pipe, how will this work?
I believe these engines are shimmed to run 30%, how ever I'm thinking of running 25%, will I need to re shim the engine?
the 9901/41029 will be one of the mildest combos you will find.... runs very nicely, somewhat limited top end and smooth power with good low end pop........the shimming should be fine for 25%.....but I am not 100% sure as I am not sure who's engine you bought and what it was setup for when it left ere