Originally Posted by Amini77
Secondary cat delete or primary? Don't the primary cats on the headers, if taken out, release more power than taking out the secondary cats?
2007 Titanium Silver 328xi: In limbo
1985 Gazelle Beige 325e: Lowering Springs, dampers, Sway bars, all bushings replaced with UHMW/Delrin, Rear Seat removal/ Roll bar waiting in garage, Corbeau F1X seats, radio/AC/PS/sound deadening removed. Home machined selector rod/bushings.. Others odds and ends.