After years of lusting, and a bit of a rubbish year at work, i figured I deserved a treat, so pretty much impulse brought a REV4 Sonic Shadow through mr2oc

Its mods list is short so far (Apexi Induction, JapSpeed Exhaust, REV5 spoiler), but over the years I aim to change that somewhat!
First question on it (and I've tried searching to no avail)... The JapSpeed is a de-cat pipe, with no space for a Cat to go in. Obviously, for MOT Time and legal running, there should be a CAT there. I can find CAT's and backboxes, and I think I know how all the pipe work should fit together now, the only thing I seem to be light on information for is sensors... Should there be any sensors around the Cat on REV4? If so, does anyone know where they should plug in to (Both Cat end, and the other end). The JapSpeed has nothing plugged in, and I see no trailing cables. Either I am lucky and missing nothing, or I need to find some stuff that I know nothing about just yet!
Advice much appriciated!
Ta
Ben
