Have you guys seen this? Gruppe M Intake
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#10
I find it interesting that the Champion fully modified race prepped RS4 uses the stock air intake.
I haven't seen an aftermarket air intake yet that gives noticeable gains over stock. $1500 for an air filter and some plastic pipe seems a bit much for the possible small gains and the chance for Audi to deny your warranty claim when your MAF sensor or something worse fails.