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I've got the ESS stage 2 tune and LOVE it. Really woke the car up. No issues so far, and super easy to install.
I also installed a ER charge-pipe (with a BOV) and Wagner FMIC to try and help with heat-soak in the hot Los Angeles weather. Power gains are modest with these mods, but it was really more about keeping consistent power. I also went with the the EVO 1 competition (smallest but lightest option) version so that no cutting was required. It's plenty big for limited mods like a tune and CP. Hope this helps.
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Current: 2013 Z4 sdrive35is MHD 2+ E50 OTS Tune, Wagner EVO 1 Comp FMIC, ER CP, Tial BOV, VRSF CLDPs, E9X Control Arms, H&R Springs, H&R Sways, Turner Rear Camber Arms, M Performance BBK, BBS CH-R wheels, Stubby, CeramicPro, Late Side-markers, Michelin Pilot 4s
Past: 1995 840ci Calypso Red/grey w/a bunch of modz
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