For all vehicles to be sold in the US, the OEM must warrantee their emission control devices for 5 years or 100,000 miles. Since the exhaust is part of the emission control system the OEMs started making these components out of stainless steel instead of carbon steel or aluminum.
It appears that DT went cheap to save a few bucks. Their claim that the headers are made of stainless appears to be true, but the air injection tubes are not. The polished finish and coatings doesn’t protect the exhaust parts since the metal failure comes from the temperatures and moisture inside the exhaust system.
I think the cracked factory exhaust is caused by the weight and closeness of the catalytic converters. Knock on wood, but none of my V8’s have suffered the cracking and they haven’t been off-road at all.
if thats how it is worded, then they didnt false advertise, right? the air injection system isnt part of the exhaust?