Did you ever replace the downstream O2 sensor? I thought that's what most were recommending to do before you went to the dealer. If you are home now you have plenty of time to do this before you hit up the dealer.
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We actually replaced the first o2 sensor before the downpipe. Maybe we should have done the other?
What do you like so much better about the Evo?
While the fiST provides an amazing driving experience the Evo is a multiplier of that same type of fun. The feeling of driving what almost feels like a go kart on the street. The Evo is built much better. But here are my top reasons: Only has 5 gears. A nice simple leather interior with heated Recaros but has much more interior room. Brembos, sunroof, HIDs, Rockford Fosgate sound system - which are all stock features. it's easy to modify and picks up nice whp gains with minimal mods. It has been very reliable being the original owner and currently at 86K miles with no issues. Capable of varying terrain (has tarmac, gravel and snow mode) SuperAllWheelControl with ActiveYawControl/ 337whp/350tq (mustang dyno) is perfect for a daily IMO.
Out of the handfuls of cars we have owned, it is by far my favorite for a daily driver.
Also, the 4b11T has proven very stout. There are more and more 600whp stock block builds these days proving this.