I bought a 2006 WRX with 15,000 miles a couple of months ago. I have installed a 3" uppipe/downpipe, headers, HKS super sequential blowoff valve, typhoon air intake and a full 3" straight exhaust. The car is a blast to drive. My only concern comes at around 80mph in third gear. Around 5500 RPM the car seems to blurp, then the cruise control light stays on and the check engine light flashes. It only happens when I am really getting on it. I am afraid that this is causing some kind of damage to the engine. Has anyone run into this problem or maybe have a better idea of what exactly is happening?
Also, I am considering buying the Cobb tuner, but realize this will void my warrenty. I am not as concerned with high horsepower (completely satisfied with how it runs now) as I am with preserving my engine as a daily driver. Do you think that doing this will fix the above problem? Is it something that would likely be healthy for the car or am I better off just keeping the computer stock the way it is? Will the gains in horsepower be all that noticeable? Should this improve fuel mileage?
Im sure this has been asked time and time again, so even if you could direct me to the proper thread, I would appreciate it.