[YoungFamous]

I wouldn’t have any problems deleting my Secondary Cats And rear Muffler from doing my research right?

[Alpha1BC]

This sounds like you're essentially swapping to a straight-pipe catback exhaust, yes? Are you keeping AFM valves? If no, then you'll want the delete module for those.

You might also occasionally get a CEL for the post-cat O2 running rich. I at least had one come up occasionally when I did a 3" straight pipe catback on my 16 non-NPP car because the exhaust flow was greatly increased over stock and the cats couldn't always keep up. Not sure if you'll have the same issue or not, kinda depends on how much extra exhaust flow you actually get compared to the stock NPP system. This isn't a big deal either way though, code can easily be cleared with an OBD scan tool.

[YoungFamous]

Yeah, sounds like it, I pulled the NPP fuse but wanna keep the AFM, for gas for now.

[chaospiece]

I have straight pipe with cutouts right before npp case.
When they're open, same basic thing you're asking about.
I have my afm as well, tones it down good for cruising.
No codes or anything on my 18 as long as they're welded perfectly they won't leak.

This combo is really good, here's a clip if you want to hear it
https://www.instagram.com/p/Bls_1aun...d=bnuvhxi1f027

[YoungFamous]

Sounds good!!