I've been thinking of this, but have to wait and see.... The boys at ESS are just about to release an SC kit for the 4.8is so if I go for that I will need to rethink the whole exhaust system from headers back.

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Current Garage:
2005 E53 X5 4.8is
1999 E39 Alpina B10 4.6
1989 E34 Alpina B10 3.5
1988 E32 Alpina B11 3.5
1987 E32 Gattermeier Motorsport Slingshot Seven
1985 E28 Alpina B9 3.5
1983 E24 635CSI

Waters Co Australia