You just have to taper boost a littler more in the higher RPM and you might be fine without downpipes....But since I have not tested personally youd need to log and experiment yourself...
if you want to play it safe just buy a set of the budget friendly downpipes for $300-$400 and then run the E30 map safely
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PERFORMANCE: JB4 G5 \ Backend Flash \ DCI \ BMS Downpipes \ CX FMIC \ ER Chargepipe \ Synapse BOV \ KW V2 \ Muffler Delete \ CDV \ ZHP Shifter \ Cyba Scoops
FUN: M3 Front \ Mtech Rear \ JL 10W6 \ ModMyNav \ V1 Hardwired \ LUX H8 \ Gloss Black Trim \ Gloss Black Roof \ Cyba Quads \ Cyba Mtech Diffuser
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