OK I HAVE THESE PARTS, NO MY Q. I DO I HAVE TO REMOVE THE AIR PUMP? IF SO ISNT THAT BELT CONNECTED TO THE ALT?(CAR IN STORAGE FOR WINTER)
AND WHAT ABOUT THE PORTS DONT THE AIR PUMP OPEN THE PORTS OR DOES THE PRESILENCER DO THAT???

 

the presilencer has a tube for that. id go ahead and get rid of the air pump cause its not doing anything and you dont seem to care about emmisions since you got the presilencer/header combo.

 

I see your car is an s4, you don't HAVE to take the airpump off. You can though. It will just be taking up space and sucking a little power if you don't. You will have to get a duel belt alternator pully though. If you don't it will squill and slip like a SOB. Ask me how I know.