A customer insisted me to design these, when they were ready, he was over the moon and send me video where he rips the car through all the gears to limiter at sixth gear. He also did various tests. Normally E39 M5 takes intake air from the hottest place, from the sides of the radiator. This leads to engine getting hot air and when stopped on traffic, traffic lights or on pitlane, the MAF's will totally heat soak and engine loses a lot power as the engine is put on the lot retarded safety map.
Erik Eriksson Design E39 M5 ramair parts move air intakes into large side holes on the front bumper where foglights used to reside. This unlocks a lots of performance to E39 M5 in all conditions when engine gets only ambient cold air at high velocity pressure and volume! Stress test shows that car reaches very fast IAT's that match ambient air temperature and after that they stay there.
NOTE: Unlike any other part that I make, this is destructive, because foglight mounts need to be cut partially off from the bumper for greater good. Mounting instructions are in the pictures. Work perfectly with stock air boxes but can be used just as well with tuning filters. Using with stock airboxes is very easy. Just put two 95mm / 3,75" 90° angle silicone hoses together with short aluminium pipe in between, and pipe clamps or zip ties keeping them together. Fits immediately to both sides to my parts to stock airbox mounts. The stock air paths can be blocked to make car's radiator working even better aiding also internal engine cooling.
