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The IS-F still has two fake tips. Two of the tips are fake on my Dinan exhaust, who cares.
My guess for the boomy-ness of the IS-F exhaust is that the 8-speed in that car tends to upshift to high gears at lower than ideal speeds which puts you on the borderline of lugging the car.
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2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R |