Got my smell fixed...

1) Pinhole in header was welded.
2) I used these clamps off ebay called "SureSeal" and they sealed the slip fit no problem. They are the best clamps I have ever used, could not believe how good they were for the low price.

http://www.ebay.com/itm/3-SureSeal-H...dVKF0e&vxp=mtr