I just installed the kinetix hi flo cats and I noticed that on the driver side the cats are really close to the heat shield, so upon acceleration I feel the vibration of the cats against the floor board. I did a search but couldn't find much, so I was wondering if anyone who has this has encountered this problem and what they did to fix it.

There is less clearance on the drivers side from the cats to the heat shield. You can fix this by hammering back the heatshield or bend it for more clearence. Hope this helps.

I had no issue at all - The Kinetix fit with ease in my coupe,

I also have the Kinetix.

If I really get on it from a stop, I hear a bump under my feet....the cats must be hitting the heat shield.

Maybe that Stillen engine dampener is a good idea......