I'm in the market for a weekend car and i've always lusted after a b5 rs4 ever since my little pulsar gti-r was eaten alive by one many moons ago. Can anyone give me an idea of how bad the understeer really is on these? I've seen a few videos where they seem to just understeer forever. How much of a difference can i make with coilovers/general suspension and chassis mods? The other car i'm pondering is an e46 m3 but they're super common these days, weight distribution + rwd does excite me though.
Any input is appreciated, hopefully test driving one this weekend but im not sure i can get away with driving it hard enough to show its true character

Thanks in advance!