Today I had spacers and springs installed at HP Autosport in Santa Barbara. I highly recommend giving Harold a call if you're in this area. He gave me a great price and did quality work. He works on a lot of performance and German cars. He said the Model 3 front suspension was just like an Audi and the rear was very similar to a BMW or Mercedes setup.
I went with 15mm front & 20mm rear spacers from Motorsport Tech. I worked with Lenny who was very helpful as I decided which spacer options to go with. I think this setup is pretty much as close to perfectly flush as you can get. Maybe even a little bit wide for my taste, but overall I'm really happy with it. Combined with the T Sportline springs, this car has a much much cleaner and sportier stance, worthy of a 50k sport sedan.
To anyone who is wondering, they do not make spacers less than 15mm which have the lugs pressed in (I asked Bloxsport too). Since the stock logs on this car are pretty short, you're basically stuck going with either <5mm or >15m... Anything between 5 and 15 will not have enough lug length to securely attach the wheels. The only option would be to pull the lugs out of the factory hubs and install longer ones. I'm not aware of anyone who makes those currently. So 15mm is the best option for the front, and 20mm in the rear gives the same flush look front an rear.
I'm also really happy with the T Sportline springs. The drop is nearly perfect. The fender gap is now about 2.5 fingers front and 2 rear. I'll get actual measurements tomorrow. As far as handling goes, I haven't had a chance to take it on any backroads, but in a bit of freeway and city driving tonight, it felt really good. It definitely is a bit more compliant than the stock springs, but somehow it manages to remain sporty and poised. It actually feels like it corners even better too, with less body roll likely due to the progressive rate rears. The springs + spacers have generated a fair amount of negative camber, so I'm sure that's helping with cornering, but will definitely create some uneven tire wear.
Overall very happy with the new setup. As promised here are some photos:
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