I made my own duals just after the cats with bullets followed directly by turndowns. Even though it hangs pretty low, I rarely ever have any scraping issues (stock ride height though...and staying that way

) . I do have a lot of resonance, but it's proabaly due to the turndowns being in the middle of the car. It sounds damn good though, I get compliments all the time. Even the cops love it
I do plan on re-doing it with gutted/cut cats, an H, flowmaster singles, and side exits with stock Z/28 tips.