Had mine done three times on my 2015 5.7 Hemi Ram. The third time the exhaust manifold was warped because the studs were broken too long and they replaced the manifold under warranty because I had a lifetime powertrain warranty. The first two times it cost me around $300. Dodge dealers have special tools developed to make it a quick repair. See if you can get your dealer to say it is a warped manifold and maybe you can get it done for free...