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      10-18-2018, 12:01 PM   #2
ksoze
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Drives: 2018 M550iX
Join Date: Nov 2010
Location: Maryland

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Not to talk you out of the exhaust, but I have found the stock M Performance exhaust to be perfect. I have both flaps open on all modes (via fuse pull) and it has enough growl to work for me with no drone. Dinan says their exhaust will give very little if any HP gain. The Stage 1 tune however is worth it.

As far as numbers, the only real world numbers other than Dinan's posted ones are from users in their documented 1/4 mile runs. The Stage 1 tune seems to cut 1/2 second off the 1/4 and likely close to 1/2 sec on 0-60. Dinan claims their stock and S1 dyno numbers were done on two machines including a Mustang dyno.
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2018 M550iX-Dinan Stage 1 | 2011 E93 M3 Convertible | 2002 E46 M3 Convertible | 2002 E53 X5 3.0 | 2000 E39 540i | 1998 E36 M3 | 1988 E28 M5 | 1987 E28 528i
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