I have repaired those leaks on customer vehicles many times. Really all they need are new studs and gaskets. Manifold can be resurfaced if warped. Broken studs are fairly easy to drill out just need to be very careful and start in the center. Usually only 1 or 2 are broken.I have a 2019 Ram Rebel 1500 4x4 Crew Cab. 1st year of new body style. The Crew cab is huge inside and the interior is top notch. Just rolled 50k miles. Have a exhaust manifold leak which the hemi is notorious for. Parts on back order. Other than that have had 0 problems. I would prefer the twin turbo v6 thats coming for more power and better fuel economy. I average 13.5mpg with the 5.7.