here's a link to a page that describes how to open up the factory airbox, http://ackthud.com/shawnfogg/1_9airbox.htm
and a link to a software guy, http://www.techniquetuning.com/
some gains are possible, just don't spend the same money on 20hp as you would for 75. BTW, the air temp resistor on Ebay is crap.
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