Just put on WSP y-pipe; seemed to fit perfectly, but started it up and now I have an obvious exhaust leak. It sounds like it is coming from the 2nd down pipe area. I used the o-rings provided, but used the original gaskets at the cat (but it sounds quiet there). Should I turn the o-ring up-side-down and reinstall or add some gasket fix there (its tight already)?

 

You did put your 02 sensors back in right??

 

I believe so. I'll check to see if they are tight.