2x Fuel Injector Index 12 for Bmw N54 N63 135 335 535 550 750 X5 X6

This Fuel Injector is great for increase the throttle response,give your car better power and acceleration,good performance.Made of high quality alloy steel material,this for bmw fuel injector tool are heavy duty and durable for long time use.Totally disassembled,easy to install,but professional installation is recommended.Direct injection engines offer numerous advantages over port injection engines. The main advantage is better atomization of fuel entering the combustion chamber. Direct injection also requires a significantly higher pressure to atomize the fuel properly which can cause components of the fuel system to fail over time. Clogged fuel injectors can cause a variety of performance issues including misfire and power loss.N54, N63, and S63 fuel injectors have an index number which is critical to take note of when it's time to replace a failed fuel injector. The index number dictates on whether fuel injectors can be mixed or not. These fuel injectors are the most recent version of what's available and can only be installed with other fuel injectors that have an index number of 11 or higher.If the injectors are 10 or lower all fuel injectors will need to be replaced to ensure proper fuel system and engine performance.Manufacturer Part Number:13537585261 13537585261-12Symptoms of Problematic Fuel Injectors:Rough cold starts - Stumbling idleLeaking Fuel Injectors - Smell of fuel or smoke from rear tailpipe/exhaustMisfires and Check Engine Lights (CEL)Inconsistent idling, hesitation and potential stalling.Type:Fuel InjectorFit for:For BMW N54 (135i, 135iS, 1M, 335i, 335is, 335xi, 535i, 535xi, X6, Z4)For BMW N63 (550i, 750i, 750Li, X5)For BMW S63 (M5, M6, X5M, X6M)Colour: black + silverMaterial: aluminumPackage Contents:2 x injector (index12)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.