So heres the thing, I'm running running dyno tuned revo software and need to go back to stock to smog the car. Are there any issues with running lean/rich if I put the stock airbox, cats, and mufflers? The car was tuned with EVOMS CAI, Fabspeed 200 cel cats, and Fabspeed mufflers.

TIA

 

This is most likely level 2 Revo tune. I would not think you'd have a problem replacing oem intake/exhaust. If there is an issue the tune can be reset to level 1 and then kicked back up after you are done. Make sure no one updates your Porsche software in the process or you will lose your tune to the tune of about 850$.

 

stupid question, but how do you reset it to level 1? I would imagine the shop that tuned it would have to do it?

 

Yes and there's probably a nominal charge. I would drive it first and see how it runs. Most tunes can accommodate within certain values.