mate all you need is a ford item mate as these are more then up to the job, a good few years back when i first had an rst and did not know much about them, i ordered a so called grp a one and all i got was a felpro one which went with in three months of fitting so i got on the phone to jano (oddkiddcreations) and he said get a ford one on there and i never had a problem with it and since rebuilding the engine i have fitted another ford one and still not had a problem and he put ford ones on his motors and i know there are a few well known s2 on here that use them as well.

so i would say get a ford one fitted and a good set-up and you will be sweet mate