- Buick Ownership
- 2012 Regal GS
I'm out of town for the next month and a half, but I have one of the high flow cat downpipes waiting for me once I get home. Questions for you guys who have one, did yours come with bolts to attach to the midpipe, if not which did you go with? Also, will stock O2 sensor for the rear work, or do I need an extender to avoid a CEL? Thanks in advance.