If you're running a tune and a downpipe you're definitely going to want to run a 3-inch mandrel bent exhaust all the way into the mufflers. You need to take in consideration of whether or not you can deal with the incessant droning you'll naturally inherit from running such a wide diameter piping. The only way to deal w/ droning would be to add some side branch resonators or whatnot. But a 3-inch all the way, preferably w/ an X-pipe would be optimal. The rear mufflers I would recommend simply gutting out the factory 335i mufflers and taking out all the internal baffling/packing. You'll love yourself for it.
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