My car seems to be running a little odd lately and from what I have been hearing from people it seems to be a diverter valve problem, anyone know a good aftermarket diverter valve I can get for my 2001 a4 1.8t? I was also curious, is replacing my diverter valve going to screw up my air/fuel ratio in any way? or anything else for that matter?

 

You can get a bosch 710n @ ecodetuning.com for $29 or a Forge DV for about $150. A new one will not affect anything adversely.