tito rotativo

i jusundefinedt installed my greddy sp2 exhaust and a kn typhoon short ram. it sounds very nice but on occasion it can get a little loud. at first i smelled oil than after a couple of hours it was gone. I also own a 2003 pontiac vibe with similiar mods. it kicks ***. as for the mazda that bitch could absorb heat. it this normal with these cars.