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From my dealer point of view :
Intake, exhaust are no biggie and they don't care at all
FMIC is a grey zone and shouldnt affect but if its a boost leak or something they might or might not cover it
Downpipe, chargepipe with BOV are NO NO on the warranty
Tune is not a problem unless it caused the issue (but I still remove my cobb everytime).
Speak with your dealer its the best way to know all dealer are different. You definetely dont want your vin to be blacklisted.
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2009 335xi Coupe // MT6 // Coral Red // Black Sapphire // Sport & Cold Weather Pkg // VMR V703 Gunmetal // Factory Oil Cooler // PTF Thermostat Bypass // Black Grilles // Carbon Fiber Spoiler // Aero Lip // LUX Angel Eyes V4 // COBB AP Stg 1 // Injen DCI w/ HydroShields // aFE Air Scoop // Clutch Stop // Boost Gauge
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