ok so putting the thing on was a piece of cake. when i stated the engine, a big ass growl came from the exhaust.l i was so stoked on that, but when i went up to look at the header make sure everything was ok and it was kinda smoking(it looked like from the 2nd O2 sensor) but for those of u who have installed it, is that normal? and second its fine at low rpm's like 2k and under. but if i hit it or it goes past 3k then it gets kinda....idk if raspy is the word i want to use but something like that. is that normal??? or does that mean i have a leak?