Blaze, fair questions there - it is a bit confusing with the EG2 Del Sols and compatibility..

Headers for B-series VTEC are all compatible but the higher deck-height of a B18C/B16B Header will hang a little low on your B16A.. not nesc a problem unless you are riding very low. I run the Spoon 4-2-1 (B16B/18C) on my EG B16A and it sits a little low but i run height suitable for track use so not a problem. I've run Mugen 4-1 (for B18C) which was about he same.

Under the hood, basically from the firewall forward is same as EG6/EG9 and so intakes for those models will work fine. DC2 Intake wont line up too well and runs too close to the HOT water hoses for my liking.

FYi the Exhaust B-Pipe for EG6 will work but the axle-back for EG6/EK4/EK9/DC2 wont work on Del Sol. We've had some customers use the Spoon B-Pipe for EG6/EK9 and the Axle-back N1 muffler for DB8 Integra (4-Door) and only requires slight modification to the hangers - the length is fine for Del Sol.

On my old Del Sol I did a LOT of experimentation with intakes etc and if you have a stock airbox, KEEP IT !! and run that one with Spoon or K&N filter etc. DC2-R Airbox wasnt too bad but it sits too close to the hoses but the OEM funnel into the resonator for DC2R (when resonator removed and funnel reversed) lined up to the bumper 'mouth' on Del Sol quite nicely to take in cold air from the mouth area. SR or CAI on the Del Sol didnt do much apart from create more noise.