I think you need the shrouding. I think the shrouds are just poorly designed and don't fit our bumpers that well. I never talked to ER about the issue. I ordered mine through Russ at HPF. If I were to order stuff now I would go through Ahmed at vivid racing.
BMW 135i Jet Black AT. Hpf intercooler, Hpf exhaust, injen intake, ER competition oil coolers, ER charge pipe, Tial BOV, AR catless DP,BMS OCC, VMR 718s 19s, BMW performance spoiler, agency power rear diffuser, slek lip (on highway somewhere), FXomar abs lip, Ohlins Suspension, All M3 bits, Cobb protuned, turner 3 clutch LSD, Escort 9500ci