I'm wanting to replace the rear diffuser on my A4 2.0T FSi (not s-line, but has duplex exhaust - single pipes). The one on the car now sems to be loose & I dread to think what happens at high speed. I've seen an alternative on e-bay that seems much more aerodynamic and has the part code 8EC071611A9AX - however these are already painted. I'm after an unpainted one - but don't want to pay top dollar to a dealer. Can anyone suggest where I could get one? also: I'm wanting it to stand out - ie not paint it the same colour as the car. I'm thinking of a matt finish in black. Again my advice? Thanks in advance, Tim.