This is a 2-Piece Cold Air Intake box for Early & Late Model m20 e30s, along with 318i, E30 M3, and 24v swapped cars.
Late model airbox is shaped around the coolant expansion tank along the driver's side fender.
Early model, 318i and E30 M3 airbox is larger, and does not have the provision for the driver's side expansion tank.
Completion Kit - Air Filter, Coupler, Hose Clamp, Metal Sleeve (additional $75)
Note: Please specify with your order which size filter kit you need 3" or 3.5".