BMW 118d N47 STOCK vs. STRAIGHT PIPE 

I tested open downpipe with the dpf on and there is literally no difference in sound.

You can never have to much airflow!

I have my dpf without the filter allready but im thinking to put a pipe inside the dpf filter so i can have a better performance at low rpm, does that make sense to you? cheers!

Way less turbo lag without the backpressure. For a non-profit engine, have some backpressure can be beneficial for the engine. In this case, the turbo is providing all the backpressure you need. Boost would come on sooner everywhere and make a better power curve if you tune it. Factory ECU would limit the amount of torque produced by opening the wastegate sooner and limiting fuel. This is because the ECU is able to make changes in real time to fuel maps and even at WOT.

Same 2010 118D 3dr auto Msport in alpine white, just mapped her, hate the sound of the engine it's awful

@@MrKieranps1990 what bhp is it running at after map? Don’t know if to get a diesel or petrol and are these 1 series reliable cheers

@@jackephgrave3171 they are part from timing chain just service regularly and will last. Make sure chain been done though

@@justtrynasurvive he asked bhp

@@afvisualss I don't know cos he's asking about someone else's car. I was just talking about reliability. I have a 118d 143 stock probably mapped by previous owner no proof so guessing stage 1 with dpf out 170hp