Not Ranked
The driver's side pipe on my car is perfectly horizontal. For whatever reason, the passenger side pipe angles down very slightly. I've never measured how much but I'm sure it's less than 10 degrees. The angled down pipe is a pain in the ass everytime I pull into a dusty parking lot or I pull off the edge of the road somewhere. It blows dust everywhere. It gets my car and everyone elses car filthy. If I were you, I'd make them come out as perfectly horizontal as possible just to avoid the dust storm. I don't think you'll notice any difference in sound.
Chris
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