cvprez

Does anyone have any experience with which aftermarket air filters would offer better performance gains for the twin turbo V12's. I know the gains are minimal, but would prefer to get the better of the two - Thanks

MRAMG1

Both are great filters, and you can NOT see the difference on the dyno or street between them. I have the BMC's ON my 600 ONLY because K/N didn't offer them when I bought them.

Either way you will win

Note: The BMC's do cost more, and I really like the k/n's better ONLY because I have almost 30 years of enjoyment with them and NEVER ANY issues.

Corsa9000

I have used K&N for years and no issues. They work well and I take them out, clean and re-apply oil every 6 months.

TMC M5

I had the BMC filters. They are normally twice as expensive as the K&N's. The BMCs were a little flimsy on the rubbery frame. The K&N's appear to have a support to add some strength to the frame (see link below).

http://cgi.ebay.com/K-N-Filter-AMG-C...#ht_2782wt_911

The BMC's were a bit of a pain to make sure the rubbery frame was exactly in place when putting the air box lids back on. I say, give the K&N's a shot.

Tom

Flight Test

Summit Racing has good prices and has them in stock.
http://www.summitracing.com/search/?...=33-2412&dds=1

Corsa9000

For those with K&N's, do you notice a difference in engine noise with the K&N's???

rondocap

I tried K&N's in my S55, and did not really notice much of a difference in either performance or engine noise. If there was any, it was miniscule. Due to that, I went back to the stock air filters - since I figured I might as well play it safe if I'm not noticing any gains!

Corsa9000

The difference is small but noticeable, specially in the first couple of days.

I8NM5

Ran K&N's in my S55 for over 50,000 miles with absolutely NO ISSUES what so ever. Just switched to BMC's with a TUNE and do notice a hint of sound now when the tb opens. May also be in my head but it seems more responsive Mayb just me, but I like em both!