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Welcome to Kassel Performance. We specialize in BMW DME ECU modifications and specifically tailor our services to enthusiasts. We officially have over 50+ E30 engine swaps running our custom BMW E46 M3 MSS54 engine computer. Additionally we have perfected the S62 BMW E39 M5 V8 engine swap as well into both the E30 and E36 chassis.  We also modify DME’s for EWS delete, virginized ECU’s, or simply general coding based on your requests.  We strive for excellence in both quality and service. Please check back as we will be on the dyno on a weekly basis perfecting tunes for all BMW engines.