is that 3-5 whp based on a factory motor or the charged one? and is that the increase in peak or across the board? there must be a strong spot that is improved. maybe a 5krpm bump which wouldnt effect your whp rating at all since its midrange torque but would aid greatly when shifting in to the next gear
also arent there other companies you could turn to for a header? i know with a supercharger it is very beneficial to have much longer/thicker runners. there must be a quality header available that is a leap above factory. with most hondas a header decent alone can yeild 10ftlbs across most rpms, some have even produced 25whp on an otherwise stock motor(with free flowing exhaust however) and then leaps and bounds on a motor with work done.
do you have any options other than dinan?
maybe forking over some serious bank for flanges and some piping and getting some performance shop to fab a header for you? who knows it could be good for their business later on...
either way i have a hard time believing that the factory header yeilds little gains to other headers on a motor that is under pressure
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