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      07-24-2008, 02:26 PM   #15
Second Lieutenant

Drives: F80, XF Super V8
Join Date: May 2008
Location: Rocky Mountain

iTrader: (7)

Originally Posted by Mr. 5 View Post
I have:

Catless DPs
High Flow Cats in the place of the OEM secondaries
X pipe in the place of the OEM resonator
Borla single muffler

Seriously guys, the reason for drone is the Auto!
Look at what I have.
I don't have any drone whatsoever! NONE.

Leave your auto in a lower gear and you'll have no drone.
Sigh... Auto trans being the case was what I feared but didn't want to hear . Thats what I get for ignoring my first instinct of going for the manual... first missing out on the $1210 auto credit by a week, then learning DCT is coming in 09 for the the convertibles/coupes, and now the auto messing up perfectly good exhausts.

Unfortuntely when cruising in SD instead of D I see my instant mileage plunge 25% lower from ~32-35mpg normally in D to 24-27mpg and it also makes the throttle a bit too sensitive for rush hour driving along with lots of engine braking.

Hopefully the muffler guy and I can jury rig a solution without resorting to me using SD all the time (which doesn't avoid the problem of when driving from standstill still hearing the bad drone/vibration reving 1500-2000rpm). I'll update later tonight with my findings.