M5Ranger

I am sorry to read about your predicament. I recommend change the exhaust.
Checkout the ASR Engineering full exhaust. You will be very happy with the sound and the power gains. The design, build quality are precise.
The power and torque gains are dyno proven.

Do not accept power loss. Have you called the company?

Good luck

Ranger

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2006 M5 Alpine White/Silverstone
Upgrades:
Engine: SS headers,Evosport power pulley,Active Autowerke
ECU,ASR custom air intakes,Dinan throttle bodies, ASR Engineering NOS kit, Evosport 3.91 diff.
Exhaust: ASR Engineering custom exhaust.
Suspension: H & R sport spings,Dinan front/rear CF strut braces.
Wheels: HRE 590R, (F) 20x9 (R) 20x10.5 w/ Michelin PS 2 255/35
& 285/30
Exterior: Vorsteiner CF vented hood, Vorsteiner CF front spoiler,
ACS rear deck lid spoiler, front kidney grill & side gills in
CF.
Brakes: Brembo GT kit, (F) 6 piston monobloc calipers w/ 16"
rotors & (R) 4 piston monbloc calipers w/ 15" rotors.
Interior: ACS titanium CF trim.
Dyno resultstraight motor 460 rwhp, on nitrous 581 rwhp/461 lb/ft rw torque

2007 GT3 speed yellow
2007 GT3RS orange
2007 RS4 imola yellow