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I think you've covered all the bases. I doubt you'll get a big increase with just a remap (though others on here disagree). The main route for more power is to fit the 330i inlet manifold and then get a remap with 330i software. Other than that, it's a naturally aspirated motor that was pretty efficient from the factory, so you won't wring a huge amount extra out of it without the new manifold.
On the P/E, you can only fit a 335i exhaust if you renew the rear bumper for a dual outlet version. You can get a P/E for the 325i (I have one - best mod I ever did). Though I have heard suggestions that BMW no longer list it, so you may have to wait for a secondhand one to appear...
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E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Swift thrust sheets; 3 x chassis braces; diff brace; N53 V-brace; 034 subframe inserts; BMS clutch stop; BMS CDV; RE g/box mounts; Delrin shift bushes; Saikoumichi OCC; Cyba scoops; BMW Perf Exhaust; HEL s/steel brake hoses; M3 rear spoiler; Recaro Sportster CSs; M3 white dash LEDs; LED Angels; LED side repeaters; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof/clear front
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