Got this mess sorted out yesterday too -- looks much nicer and more secure than before, I wish I had the time to drum up an in-trunk custom system I love looking at pictures of those. Oh well, this will work just fine.
Also managed to fit both filters in this area so that the charcoal canister is all that has to go below the booster. Got that mounted just with zip-ties as well but no pictures. Ah the pains of a two-pump system...
Real injection hose used throughout
My e46 needs some lovin too-- so in for an oil change at bimmersport tomorrow morning then right back out there to get the rack in