airbag light can be re-set via diaganostic equipment, and i dont believe you need your red key for it, not many people have cause to use the red key anyways. as for your power issue could you explain a bit more please, it could be a faulty maf sensor as these tend to go if your using an aftermarket filter or its become dirty
the airbag light can be reset, there is little point however as it will just come back on again (mine has been reset 2 times and went off for about 2 weeks each time)
power, the hgt has a very smooth power delivery. if its not pulling after 4k its going to be a maf most likely, these can be cleaned but dont, just get another one
there about £120 (go for a genuine part, not a copy)
if your still wanting more power, give it a good service, there very picky about spark plugs, and go speek to flee on fccuk as he now has a chip that will map it to about 155 (better mpg and power delevery)
hi there. Congrats on 1st buy. I have issuse wiv power, i think it needs a good service and new maf.i know what you mean about it not feelin quick. But they aint slow.sometimes it feels rapid and others just sluggish. You cud try resetin the ecu.. Info in the repair guide on here on how to do that. I love my hgt to bits.and they are quite good on fuel if you drive careful.i got induction kit on mine. Sounds awsome. Oh by the way any pictures to post?