Very interesting on the DISA valve. I had it off when I did the plastic coolant pipe under the intake manifold earlier this year and it seemed to work and seal properly then. I'll see if I can get it off and apart today and report back.

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2000 e39 M5 Titanium on Black
2006 e53 M54 Titanium on Black
2007 e83 Black on Black Sport pkg
2004 Avalanche 2500 lifted 4.88 gears
1994 jacked up Jeep
1987 GMC lifted short bed on tons