Exhaust manifold leak repair
 

I have a 2011 NPR with an exhaust manifold leak and am looking for suggestions on how to fix it myself. I have talked with some others that run these trucks for companies and I have heard of using exhaust manifold bolt repair kits from kral auto parts come up a couple times. https://www.kralautoparts.com/parts/ . Anyone here used these before? It fits to the manifold and bolts a clamp down, without having to remove anything. I'm sure this would save a ton of time and money since a shop quoted me $3,000 to fix it... not sure which direction to go, and don't feel like drilling it out myself.

Any ideas or feedback would be appreciated.