DaFish - we are thinking alike. We have the same performance mods on our 335. I was contemplating the same thing as you (M3+blower or GTR or 911T or ...) about 6 months ago and decided on the M3. Picked up the Akra and catless mid pipe already and am looking at an ESS VT2 600 kit right now...and my M3 should be here any day now (ordered a 2013).
I did actually race biglare in my 335 in a roll-on event and that thing is wicked! Would be terrific to see that car go to someone like you.
Daily: 2015 991 Turbo S White with Gloss Black Aerokit / GIAC
Track/Airstrip #1: 2013 e92 M3 DCT / ESS VT2 650 S/C / Akrapovic Evolution / StopTech BBK
Track/Airstrip #2: 2011 997.2 Turbo S PDK / GIAC FBO / GMG suspension build
Beaterz: 2013 X5 3.5 Sport, 2015 Wrangler Unlimited
IG: longboarder949; YouTube: https://www.youtube.com/channel/UCT1...eoFBszPIK0gf9w