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I built my own smoke tester when I had the same issues. Mine had a leak at the ICV hose and the oring at the DISA valve. Fairly simple fixes and got a smoke tester for about $35
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2001 x5 3.0 (sold with broken motor), 1990 e30 M3, 1991 318is, 2002 325i, 2008 335i Dinan stage 3 6 speed,
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