Originally Posted by ozinaldo
There is no way that you will have a gas smell because of a mid pipe change since you still will keep primary cats in your down pipes. No one in my knowledge reported any issue like this with any of the well known aftermarket midpipes.
This is not quite accurate. When I installed my catless midpipes (Akrapovic), everyone in my family noticed. Not horrible (unlike catless downpipes), but there is a difference.