hi, i've recently installed a tanabe muffler onto my civic. after turning off the engine and opening the hood, the engine feels a lot hotter than usual. is this just normal? do i have to change something on my car to support my new muffler? btw, i've also had my filter change to hks prior to installing the muffler (but it works just fine until intalling the muffler). am i doing something wrong or forgetting to put something. i need your advises. thanks.. God bless.