So here’s the issue I’m having. I have had the fully built motor for sometime. I recently turned the boost up to 17# and car runs great, AFR values stay at 12.2 which I know is a little towards going to the lean side but my car runs great when in this range if I add more fuel the car starts to sputter after about 8 seconds at WOT. Any idea what is causing the sputter in the top end? Recently added 30’s but I don’t think that’s what’s causing my issue..

Any help would be appreciated.

K&T turbo air to air.