Oh dear, Tamiyoman....
Step away from your VAG loyalty and what you've been spoonfed by 3rd hand info, let's just deal with facts, eh?
RS4 is better than an E46 but not a CSL, E9x is better than an RS4. Tunable?? There's (by comparison) nothing on the M3 aftermarket, simply because it doesn't need it...
The very same source of your stupid opinion also puts the E9x leagues ahead of the RS4.
If you're calling M3 owners Barrow boys, then RS4s are drug dealers cars.