AFR RICH AFTER MUFFLER SWAP?

[1BLCKSVT]

I got my car tuned on SLP LM1s and was bored on YouTube one night watching a video (4 videos) of another cobra with Magnapacks. Long story short I ended up buying a pair and got them installed.

On the way home I made a pull and noticed my AFR @ 10.1 when I had my SLP LM1s I was tuned on 11.2 Can a simple muffler swap cause me to run rich or should I start looking somewhere else? Any input helps thanks guys

No check engine light

 

[boostftw05]

What kind of A/F gauge are you using? My innovate MTX-1 sometimes has to be re-calibrated If I make any changes to my exhaust, Idk why its so finicky but it is.

 

[1BLCKSVT]

What kind of A/F gauge are you using? My innovate MTX-1 sometimes has to be re-calibrated If I make any changes to my exhaust, Idk why its so finicky but it is.

Im running the AEM AFR gauge and I didn’t think about that I will try re-calibrating it. Thank you!

 

[BLOWN9646]

Probably bad sensor if it stays at 10