Need a bit of help with replacement exhaust.

Have a Felicia 1.3 Skoda challenge rally car, and it appears the cat and centre box has blown and need to replace, not sure if an original or performance exhaust but either way need to replace 1) for the MOT 2) upcoming rally.

Anyone any good suggestions, been quoted £100 for replacement system (cat back) but that is just original part not performance, anyone know where I can get performance part in lieu of standard?

been trying to find a sports system for ages now, most are discontinued.

butts of bawtry used to advertise some sort of sports exhaust, but they never gave to much detail on the web site. i must chase that up again.