Originally Posted by
Provocateur
To bolt a header with a 2.5" collector to a stock cat, you need to cut off the stock header flange on the cat and have a 2.5" flange welded on. In addition, you will need a 2.5" donut flange. You don't need a bracket.
I wouldnt recommand you reuse your stock cat... unless your trying to save $.. go buy a 2.5 or 225 carsound cat from ebay...its like $55 for Cat and $6 for the flaanges..