Ok fellas i need some help, since i have all these big bad diesels after me i have changed my setup looking for more power. Today i just installed lpp
long tubes an d 3''ory, first time with no cats, I know my tune needs some changes now and im going to worrk on that tommorow, but what noticed today driving around is before with wideband behind cat in rear o2 bung gauge read steady about 14.7 14.8 unless in pe now at cruise gauge all
over the place. I logged the ride and o2s where working like they should, is this just because tune is way off or is this normal with no cats?

 

My wide band was behind my cats and read very steady at cruise until I went into PE. The cats were doing their job. Mine did the same thing once the cats took off and now the WBO2 readings vary a lot at cruise.

Do check your tune as the VE has likely changed with adding the LPP longtubes and ory.