Fair chance the N55 will use the same intercooler and intercooler location as the N54. No real reason for BMW to retool that part. Piping will be different obviously.
A single 3" catted/catless downpipe will be easy enough to make. Catback exhaust will be very easy to make. Hell, we might even get a legitimate intake.
The answer to the N55 question lies with valvetronic.
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