I'm running now with a schnitzer performance module and I have no smoke at all. Even when doing a kickdown. So I'm very happy as I have the mufflers from a 4.4i hanging at the back

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'82 Autobianchi A112 Abarth (weekend toy)
'89 Lancia Delta Integrale 16V (very fast weekend toy )
'02 Z3 ///M roadster
'02 ///M3 SMGII