I'd like to implement the tweaked stock intake manifolds with crossovers from needwings.

The car is an unpullied SLK 32 AMG (SRT6-engine). I asked several tuners if an ecu-tune is neccessary for the new imf. They said all 'no' and 'you need only a tune, if you go pullied' - but I'm very skeptical.

MAP- and IAT-sensor are before the restriction (not after) - so an indicated boost drop possibly matters - especially on open loop. The boost drops with the imf by 3 psi at peak rpm on a stock (unpullied) car - but the air flowing through the engine is at least the same.

Think about this: you drive with stock!-imf trough the mountain - the boost drops because air pressure is lower (boost 11.5 psi). In this case in open loop - my thoughts - the ecu gives less fuel - and this is absolutely correct because you have less air. But if you drive on sea level with the crossover-imf (boost 11.5 psi) you possibly get lean.

Who knows it - are the tuners right - no tune neccessary - and how does the ecu work in this case?