I recently bought a standard WRX new from the dealership. After the initial break in period where I kept the revs below 4k for the most part I've started to open up the engine. It certainly seems fast but in brisk acceleration it seems to hesitate slightly above 4K rpm especially in second gear. I'm wondering if this is an issue with me driving the car incorrectly or if there is something wrong with the engine IE the Turbo or fuel injection. When I first drove the car off the lot there was a fairly strong smell of hot rubber/plastic coming from the engine compartment. I called the dealership and they said it was just some coating on the exhaust heating up and that it was normal. The car has about 1500 miles now and it still smells a little like hot rubber or plastic when I drive it quickly. There have been no check engine lights or odd sounds. I also just bought a new K&N high performance air intake. Should I take it to the dealership before putting on the aftermarket intake? Is the issue just in my head and I just need to floor the gas in order to experience the 4.7 second zero to 60 or is there something possibly wrong with the car?