Installed sp elite problem
 

I feel a very small leak where it bolts up at when the car is idling.

I tried to tighten it but can't anymore because of the angle I am at. Does it matter if I have a tiny leak there? If it does I guess I'll go to an exhaust shop and just have them tighten it.

The leak is on and off, sometimes I can't feel it.

Seal with high temp rtv or use double gaskets.