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my 2 cents on the siren... My turbos were making the sound but a hardcore whine at mid rpms. I say mid because I wouldnt go high as I had no boost and didnt want to lean stuff out. Turbos ended up being bad at 120k miles, thats fair at least. I have no sound clip but its a very loud whine that could not be mistaken... 0 boost and everything was connected correctly.
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2011 335is 6spd - White with Black Base : 5in VRSF IC / BMS CP Raceport BOV / Arm DP / RB Inlets / JB4 w/ MHD BEF Race / Meth cm10 / Modified CDV / BMS DCI / Stage 2 LPFP / Spec 3+ Clutch / - RB 2+ Turbos SHE LIVES \ Ew @ Comic Sans
1992 NA6 Smurf miata - pretty much dead / parting out
2005 Ex 250 ninja
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