93 Octane

Bmw 2017 Stage 2 93 octane mods downpipe and inbox filter Xhp stg3 Probably hfpf issue (oem)

Refund

New forged BBS wheels. Also, I went back to the pink spring for my Turbosmart diverter valves. The lighter blue spring with 11 washers was preventing the exhaust port from opening all the way and leading to boost spikes as high as 27psi.