Happened to me when I first installed it...drove for about 15 miles out of boost and everything smoothed itself out.....idle is perfectly fine now...I randomly read somewhere that you can run stage 2 without a testpipe...is that right?

 

I have a bone stock 2012 and upgraded to v400 stage 1 93.
Didn't have time to do much logging at this point.

Didn't see boost pass 22psi.
Didn't notice any additional power over stage 0, so I am not sure where the power is hiding.

One plus is that car is a less jumpy upon lifting off throttle.

Still not feeling the love.

 

I installed my stock airbox yesterday and loaded up the stock stage 1 91, I only had time to do 1 pull from 2600rpm - 6000rpm and only hit 18psi. Everything else seemed fine idle has returned to normal, no knock through the pull and the LTFT/STFT were under the +/- 8%.

 

FWIW, I no longer have the issue you mentioned OP. It cleared itself up, I honestly think its due to a kind of "break in period" Although I'm still getting random knock.

 

The stock intake is working well for me now, no idle fluctuation and the car pulls strong and smooth. I'm just gonna be sorting out a small boost leak this weekend and then have some fun doing some pulls. Might just buy the cobb sf and use it until i head down to english racing and get tuned with the ets exhaust.

 

The guys at cobb know about the idle issues. Hopefully they will sort it out when they release the ots maps for 2013. Though, your ecu should adjust to the new flash over the next 20-60 miles. From what I hear almost everyone ran into this issue.