I recently had my car tuned and it seems like the numbers are quite low. The tuner had my A/F ratio at a constant 13.1 Dyno was 346/350. My car has 100k on it and the compression test was fine. I never changed the 02 sensors wondering if this could be the issue. Also have SLP ls6 intake on the way to improve numbers... What do you all think. Mods are in my Sig.

Thanks in advance,

99 Red Z28 A4
Comp Cam .224/.224 .581/.581 114LSA, 3.42 Richmond Gears, Hooker LT's, Hooker ORY, Hooker Catback, G2 Air Induction Lid with K&N, Fasttoys Ram Air System, Powerslot Rotors, BMR Strut tower brace, LCA's, Adj Panhard Rod, Spiderbar subframe connectors, MSD 8.5 ignition wires, 160 hypertech thermostat, Custom Programming.