No, those prices I listed were for the intake - not exhaust. I paid $88 labor + about $250ish for parts (pipes, tips, muffler, splitter, hangers, etc...). The reason why a lot of places charge over $100 for intake installation is because they add the time the car just sits there with the battery disconnected - ripping you off by charging you that extra hour of "labor".
Anyway, here's the update:
I looked it over - everything seemed to be connected firmly and nothing loose. I took it back to shop - they basically said the same thing. But they took it apart and put it back together - same problem. They called
K&N for assistance, they basically said to turn the battery off for 1 hour - not much help there. We did that. The car was working fine, the CEL turned off and no coughing sounds and such. I test drove it to a gas station and went in for like 1 minute. When I started the car back up, same problem started again (CEL and coughing sound). So obviously the air intake is installed properly, it has something to do with the sensors. I took the car to Autozone to check the codes. Here's what they gave me:
P0113:
The PCM has determined that the input from the intake air temperature sensor is higher than expected for the current engine operating conditions.
P0102
The PCM has determined that the mass air flow input is lower than expected for the current engine operating conditions.
Any ideas?