I recently installed an RC350 Revel Medallion exhaust on my 2016 IS 350. The sound is louder than expected and I noticed that I am getting a leak between both sides of the midpipe and axel back sections. The stock gaskets looked good, so I'm not sure if I should've replaced the gasket with different sized ones. Anyone have any experience with this installation that can give me some pointers before I lift the car back up?

 

I'd get it inspected by a muffler shop. Imo, I'd get replacement OEM donut gaskets, spread a **** load of gasket sealant, and impact gun those bolts to nirvana. Get the engine running, and check for leaks