I have a 18 challenger 6.4 with a mid-muffler delete and im thinking about catless mids. I know ill need a 02 sensor extender and the JBA ones need a pipe expander. Who has ran them and whats your opinion on them.
While I haven’t had the same exact setup as you ask, I have ran no cats for years on my Challenger.
Longtubes to no cat mids, x pipe and turn downs.
Going from cats to no cats didn’t make that setup much louder but it did let the raspiness out (like a drag car).
I love the fumes of no cats but that’s just me.