I don't want to hijack the thread -- but what you're saying is that a turbo or forced induction car doesn't need a X pipe because the exhaust gases are PUSHED out of the cylinder etc -- rather than a non FI car that is filling the cylinders with atmosphere - and can use the help of the X over pipe to "scavenge" so exhaust??
Makes sense - and I know you didn't SAY that - I'm inferring it from your response... So is this "true" or "false"?? Or "sort of"?