Are you positive that the ECU isn't trying to compensate for a lean condition? Which would explain the rich condition. Clearing the CEL may still require the car to run a cycle. Either that or the car is a basket case and needs K&N intakes to survive

All signs point to that not being the issue, but in the end it could be possible. Customer brought the car home to remove the bumper and inspect the intake so we did not take anything apart.

Just so we can put it out there, this car made 40hp over stock with its original tune, so after loosing 30 its currently about 10 over stock with the addition of the Takeda and AAM combo. (removed stock Y and Mid pipe, removed K&N intake)

We have never seen the addition of an exhaust harm these cars, so I would be VERY surprised if that was the case. The only variable that currently seems logical is the intake.

I ve heard of people losing power with tekeda intakes before....30 seems like allot

The only difference is the single filter( Takeda) VS the dual( Stillen) and I actually just change my takeda to a dual system tho and thought I felt a difference :/

Theres been lots of debate about the single filter making the TB's fight each other for Air. Makes sense,

I'll now if there is any difference when I hit the track in Oct

Post logs. This doesn't violate any sort of intellectual property. The logs should give a good idea of what the issue is.

I had an Uprev tuner before and did log some runs with different season. During the summer month, I was hitting the desired AFR target, but winter comes AFR seems a tad rich due to extra moisture in the air. I noticed that in the first year of my Etune and the following past years this always the case. It might also be important to tune the car in near ideal average ambient temp? Mine was etuned during summer time which was around 80+ F.

What I did after was to create a winter performance map and summer performance....problem solved!

i got a different tune, street tuner. problem has been solved.

numerous issues he found in my maps, to sum it all, main issue was fuel

will dyno it soon to see numbers

Glad you got it figured out !