Purchased from MX5 parts approx 6 months ago, never got round to fitting it and now car is sold (still in sealed unopened box as received from mx5parts)
https://www.mx5parts.co.uk/centre-exit-sports-exhaust-with-diffuser-mk4-p-4349.html
£350
Also used K&N airfilter (done 1000 miles)
https://www.mx5parts.co.uk/filter-mk4-p-4107.html
£30
prefer collection from Farnborough, Hampshire