This past summer, BMW released a dealer-installed $550 Performance Edition package for new 135i and 335i models, and now the company has announced pricing and details for the retrofit version of that package. Interestingly, the retrofit Performance Power kits are dealer installed just like the Performance Edition package, but are intended for existing single-turbo N55-powered 135i or 335i owners and lack that package’s (admittedly minor) cosmetic tweaks. Apparently, the retrofit package has been available through BMW dealerships for some time now, but BMW has only just announced the pricing and details of the kits.
We’ll get the bad news out of the way up front: the retrofit kits are a bit more expensive than the Performance Edition fare. The kit comes in two flavors that BMW is referring to as Version 1 and Version 2, which cost $599 and $1199, respectively, not including dealer installation costs. Version 1 consists of updated engine-management software for the ECU and Version 2 includes the same ECU reflash but adds an auxiliary radiator and upgraded radiator fan. The good news is that whether you splurge for the hardware or not, the ECU reflash adds 20 hp and 32 lb-ft of torque to automatic-equipped models (17 for manual and dual-clutch-equipped models).
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