It's really hard to throw out a price for these cars....way too many variables. On top of that, it takes the right person who's looking for these type of cars. Most people don't want to mess with a 15-ish year old BMW....especially one with the N54 that's known for all it's issues and high maintenance costs.
The best thing to do it search FB marketplace for your area, and see what other 335i's are going for.
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2007 335i, BMS DCI, BMS Chargepipe w/Tial BOV, ARM Catless Downpipes, silicone inlets, Bilstein B12 Prokit Suspension, Whiteline subframe bushings, Front/Rear M3 control arms, G-Plus FMIC, Stage 2 LPFP, Custom E40 tune by Justin (V8Bait), xHP stage 3 transmission flash, RB Two Turbos....10.90 @ 128mph