I got my new 98 trans am today a4 44k on the clock. I love it. The car has a slp cat back on it did he come with it or did the other owner put it on. And i assume i should keep it and not change it cause car sounds great.

2 ? is there is a little box hook up to the sensor right before the tb and it is call a gorilla chipz stage 2. its a little box with 2 wires going to the first tb sensor. do i leave it take it out. when i got the car it was not pluged in. tx for the help