I have recently mounted my autotune O2 sensor and it were placed a little close to the chassy. View image: IMG 20140108 215721
the cable isnt being pushed super hard against the metal and i didnt use any force when installing the exhaust. But I wondered if the cable would get damaged over time for being 90 degrees and will vibration from the engine have any effect?

 

I don't think there will be a problem so long as it's resting against the frame more so than it's wedged against the frame. Just keep an eye on it.