Quote Originally Posted by SeverAMV View Post
i've heard that some people have done a quad carburettor conversion, but i cant seem to find much info on it. seems to be a worthwhile conversion that could bump up response. aside from that, you could search for the keihin cv dual carb mod on this forum, or replace your airbox lid with a cut baking tray to expose the filter, with the base of the airbox acting as a heatshield of sorts. you can remove the air resonator box thingy at the start of the intake and replace it with a hose getting air from the outside of your car if you dont want to remove your airbox lid.

other option is ebay bolt-on turbo. not too bad according to some people if you run low boost, and you wont need ecu tuning as its a carb.
there's plenty of quad carb conversions for the d15 motor examples on www.d-series.org and search

some variants using kawasaki carbies with a custom manifold, sounds great, looks awesome, good gains, but end of the day efficiency is no where near using a b series into the ED platform...