Coolant leak is a small leak where the lower rad silicone hose simply does not clamp tight enough. The rad is new all aluminum, the reservoir is new and everything else is new or in excellent condition. Once I slap on the new heavy duty clamp the issue will be resolved. As for the O2, I have the catless 4-2-1 header. It's just as well made as the stocker with significantly less restriction and a lot more noise. I do not think the stock unit would deliver the power I currently get. As stated earlier, the light affects nothing. It's just annoying.

BTW, the sound inside the car is decent. The stock radio and speakers sound pretty good and I can hear them without resorting to anything drastic. I could use some more sound deadening and I may try that later but I have other projects to attend to.

 

My Milltek is resonated but I also have a catless 4-2-1 header that contributes significantly to the noise. On start up it's slightly more than stock. If you are reasonable with the throttle, it's got a nice deep sound. It's really only when you hit that go pedal that she opens up and makes a racket. Since I only do that once in a while, it's ok for me. The car has sound deadening (except in the doors- they sound like a tin can. Red Thunder II, on the other hand, has the doors done and they sound solid) and it's reasonable inside. I think I may add a little more to see if I can get Lexus levels of quiet, but that's just a side projects to keep me entertained. And right now, I have several other projects that need my attention first...