FYI it is pretty hard to get a 135is. If your dealership doesn't have an allocation for one then they have to trade for one, and the chances of having that happen is slim because no one wants to give them up. It took me a week to finally convince a dealer to trade with me for one. And no, you can't turn a 135i build into an "is", I tried, that's straight from BMW themselves.
Daily Driver: 2014 BMW 528XI M-Sport- Carbon Black, Mocha Nappa Leather, 100% stock.
Weekend: 01 Audi S4- Tial 605 Turbos- 477whp/468wtq