A local HDT repair shop replaced my broken manifold and gasket. The ISC engine is known for broken/cracked exhaust manifolds because it supports the entire weight of the turbocharger and exhaust piping.. The Cummins replacement manifolds are cast heavier and stronger to withstand the weight of the turbocharger and associated piping.
During the removal process 4 of the 12 manifold bolts broke off despite my soaking them with penetrant every day for 2 weeks prior to the appt.
If I may I will offer you a tip, prior to the appt. completely remove the bed frame and anything else that would restrict engine access.
Put carpet protector on any carpeting (I even covered the tile floor) as the mechanics will be in/out of your MH many times during the process.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy