thanks for all replies guys.

2 options for me looks like,

1) 2nd hand standard system, get it fitted for MOT, then re-fit custom?

2) go to longlife for them to fit CAT for MOT?

which one sound better/easier/cheaper?

Also to add, would a 2nd hand standard even fit, with this custom manifold, or just also buy standard manifold aswell??

Thanks, Ben