Had the exhaust installed today, 2.5" from the turbo back... No cat. Running one Dynomax muffler. The car doesnt seem to have improved- if anything, I just lost bottom end power! Plus, without the cat-- the fumes from my car give me a headache while sitting at stop lights! Not exactly what I was hoping for after spending $400! Tomorrow Im going to have my valves adjusted, because there is a slight tick coming from my engine. (only noticeable when i give it some gas)Hopefully there is nothing majorly wrong with it!! And, Is the airbox the box that says "turbo" on it or is that something else.. thanks!