Very nice, I'm assuming that is a genuine one, right? if so, this is the first time i have seen it on a UK car. Also, if genuine, it will be very good quality as Hamann aren't your everyday small time tuner!!:thumbsup
I would take that to a tuner eg Evolve/Evo-s or any other good one that is near to you and have that remapped without the MAF and new filter at the end of it. That will give you some good gains and awesome pickup/acceleration. With the MAF its just about the sound with very little power gains.
You could also find out if they can put a filter inside that carbon plenum similar to the E46 CSL, that will have a much larger surface area so will take in a lot more air.
keep us posted, I really want to see how that runs and power gains if you do decide to go mafless.
looks very similar to my hong kong ebay one, but I am running alpha n with no AFM
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