Thats strange.... ive never had a CEL after exhaust install.
Id try the computer reset, and if it comes back go to your choice of parts store, autozone ect and have it checked.
12 RCSB Express- 5%Tint, Gatorhyde spray-in, Black OEM Tips, Plasti Dip badges and Interior, CBE muffler,AFE CAI, Kenwood DDX370, Ks3.5s, Pioneer 6x9s,BT 964SP lowered on oem chrome 17's and some LEDs... Plenty on the To-Do list
New audio build in progress