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I am told that in studies done on each of the filters and the AC is about the best even compared to the Mobil 1 and K&N. I am personally using the Amsoil, but only because I put their oil in for the first time and wanted a filter that would match the change cycle.
 

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Discussion Starter · #11 ·
Thanks for all of the suggestions. I used K&N in my Contour SVT, and my brother is also suggesting that I use the Amsoil oil and filter - I think he's a preferred customer, so the price would be good - but I've almost decided to go with AC-Delco's UltraGuard Gold. Just a GM thing, I guess.
I've even decided that I might not go with a Borla Cat-Back - will probably go with Corsa's Sport system (PN 14189) because it's offered for sale at the dealership. I'll have to look at both systems a little closer before I actually decide for sure.
 
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