1: Do slide it back, but make sure not to break the plastic clip when you bend it up.
2: CORSA exhaust is nice (if that's what you are looking at) Don't expect a HP increase at all. You won't notice mpg increase eaither.
You will notice a better exhasut note though. ...esp in the sport vs the touring. The touring sounds good to, but the sport is louder.
3: AP angle/ DP angle. Don't worry too much about that. If you are using up all of that angle, you're going to be scraping bumpers anyhow. It does help with the rear quite a bit for AP angle though. Once engaged it shuts back off after you hit 40mph.
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TAIL RATED!
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