The Merce

If you have a 2005.5 S4 and are about to order Stratmosphere's Hyperflow air induction, make sure you specify that you need the new bulkhead design for "2005.5"..that specific bulkhead was redesigned for the 2005.5, enabling the filter to fit in proper alignment with the cars induction hose...I learned that the hard way when I was incorrectly sent the kit for 2005, instead of 2005.5...and had an awful time trying to align the filter...

Eddie Man

Thanks for the insight...A presume that applies to also, post 2005.5 production.

hottuna

Thanks. I have one on order and will double check now.

PlumSmuggler

Good tip. This applies to '05 B6 S4s as well, I had the same problem.