Well, this is what has me thinking:
"The lower the charge intake temperature, the
more power is produced, so the underside of
the airbox was given a coating of reflective
material to deflect the tremendous amount of
engine heat ... this drops intake air
temperature by up to 24 degrees, and it's
worth as much as 20 bhp because ignition
maps push output down to prevent
pre-ignition when the air is warmer."
That's from a Bimmer Magazine article about
the Nowack N500, an M5-based tuner car. They
ended up using the stock airboxes instead of
open-elements but with revisions. Comments?
T.
