Not in relation to one of these cars but after an engine rebuild I did back to back testing on a rolling road on my race frogeye sprite running twin webers. Did a run with filters (piper cross socks that some people say are useless) and a run with no filters at all. There was virtually no difference in power at all (less than 1bhp) when running with no filters at all and therefore no restriction. My brother spent a silly amount of money on a carlos fandango filter on his single weber similar spec engine and lost 8bhp with it over a K&N that was on there previously. Went straight on ebay afterwards. If there are slight gains with a better flow air filter you are unlikely to feel any difference on the road. The K&N panel filter would be my recommendation; you don't want to end up spending money to have a reverse effect on any gains.
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