Originally Posted by zanelefko
Yes, different maps allow different boost. On map 1 for instance you only have intakes therefore you will have alot of restrictions on the exhaust side (catalytic converters) and even on the intake side (oem fmic) as you take away these restrictions the car will "breath" better allowing you to up your boost to higher levels while "freeing" up the motor and allowing higher boost levels such as map 2 (downpipes, intake) and map 5 (full bolt ons +meth) and map 7 (race gas map)
This is not correct, boost level is dependent on turbo and wastegate cycle you can’t magically get more “psi” by adding an intercooler or intake or exhaust, mods allows the engine to operate more efficiently which will make more power at the same boost level but boost is not increased.
Lastly, the amount of boost that you can run is not dependent on mods as much as you the people who make them want you to think. In the N54 motor its all about octane.
Having stock exhaust and cats will make the engine work harder and run hotter, however if you are running 104 octane you will still make a target boost level of ~16psi you just won’t make as much power as someone who is running 16psi but is fully modded.
Garage Queen: Audi S4 4.2L V8, Vortech Supercharger, Bilstein PSS9 Coilovers, Sway-bars, RS4 brakes and rear BBK, Fast Intentions - Full Exhaust, 505AWTQ 0-60: 3.8s
Daily Driver: E92 335i N54: JB4 G5 ISO29 w/BMS E85 Flash, quaife LSD, BMS Meth, AA 6” Sport IC, BMS Charge Pipe: 421hp/466tq 11.9@118mph(stock intake & exhaust)
Company Car: 991 GT3 RSR