i have piping that is about 2 3/4 inches wide, and i am afraid that it sits too low (the car is lowered 3 inches) and will be a problem. Are there any alternatives that i can do with the exhaust and still have a sound good and good performance?

My Z is lowered also (not 3 inches maybe 2) my header seems to be bottoming out. Down where the header ends and the rest of the exhaust starts. Usually tall speedbumps or driveways will scrape a little. The rest of my exhaust doesn't touch. I have 2 1/2 pipes. It was custom made so it fits pretty tight. If you bought a kit that bolts together it won't fit as snug. Take it to a muffler shop and see if they can tighten it up. Good luck.