i really couldnt say, depends how much the car understeers and how much damper travel you have at your selected ride height... Porsche boxters can suffer from understeer once messed with on a track, apart from dialing in damper settings and drop link/arb settings etc id go softer on the spring, 550-450front is what would work ok as an all rounder, also id increase rear toe out to help the car have more oversteer which will cancel out the underteer with a good driver.. on a much heavier car up front eg a 968 id fit 800`s all round or a balance of 1000/800... On a car like a R5 id have to play with to see what works, ive never tracked a front wheel drive and there is more peeps on here with more fwd knowledge than me... I really should have a play with my clio 16v i have up for sale in classifieds...