Exhaust & Emissions
Most exhaust jobs start the same way. The truck gets loud, or you hear a rattle underneath over bumps, and it's louder some days than others. If you bring it in when it first starts, it's often a weld or a clamp at a joint that's worked itself loose. Wait a few months and the rust spreads, and what would have been a weld turns into cutting out a whole section of pipe and replacing it.
A rattle usually means a heat shield or a hanger has broken loose, not that the pipe itself is failing. We drop the exhaust, find where it's loose, and reattach or replace what broke. That part's usually quick and doesn't cost much. A flange gasket or connector gasket blowing out is another common one. You'll hear it as a tapping or popping noise right after startup, from up near the engine rather than under the middle of the car. We replace the gasket and check the flange hardware while we're in there, since the bolts holding it together are often what let it start leaking in the first place.
Smelling exhaust inside the cabin is worth taking seriously. That's not just a noise problem, it's carbon monoxide getting somewhere it shouldn't. We inspect the whole system for a leak point, usually starting at the manifold and working back, and won't let a car leave with that unresolved.
On some V8 trucks, a leaking exhaust manifold gasket can look like an oil leak. Oil pools on top of the manifold, then burns off and smokes once the engine's been running a while, so it looks like it's coming from the exhaust. If you're losing under half a quart of oil a day and see smoke after the engine's warmed up, that's usually what's going on rather than a head gasket or something worse. We run the engine about 30 minutes to get it hot enough to reproduce the leak, then find the source before you pay for parts you might not need.
On an older truck with rust through more than one section of pipe, we'll tell you straight if it's worth patching versus replacing the whole run back to the muffler. Sometimes patching a rusted-through pipe just means you're back in six months paying for the same labor twice. We'd rather say that up front than sell you the smaller job.