What I'm leaning to right now, is to fab up a mount that puts the injector inside the intake duct axially pre-hat, and runs the line to a bulkhead 6-AN fitting. That way it sprays the mist with the airflow, and it should atomize/mix reasonably well when it hits the hat. Not overly obtrusive and should work well. Hardest part will be making the mount.

pump's 3/8 NPT output -> NPT-6AN fitting -> 6AN hose -> 6AN bulkhead -> 6AN hose -> 6AN-NPT fitting -> injector

$15 Pump and injector fittings: http://www.summitracing.com/parts/su...n/media/images

$7 bulkhead (90 degree side goes in the hose for a straight feed): http://www.smileysracing.com/shoppin...i=22272&c=1602

6AN Gates hose is $2.25/ft for 6AN so that's not a big issue. I'm going to check out the hinged/removable pass side inner fender idea.