Hey I'm new to the bmw side so I'm looking for some advice on power/tourque gains , Iv got a e39 4.4 v8 on 107 thow miles with with custom exhaust system and the air filter is ... Well huge to say the least , I was told bout swirl flaps on the intake? If I was to remove would i gain anything with a few more mods and a remap or would this caurse damage to the engine in any way ? And can u blank them ?would like to super charge it in the future or twin turbo as i know u get the most gains from them but looking for little cheap bits to do to for now , unless I turn jap again so any advice would b nice , cheers guys