A failing exhaust system is more than a noise problem — it's a compliance risk, a health hazard, and on a diesel truck, a direct threat to engine performance and fuel economy. At Paul's Repair Shop in Indianapolis, our technicians diagnose and repair heavy truck exhaust systems and emissions equipment from the manifold back, restoring proper flow, reducing harmful emissions, and keeping your rig road-legal.
Whether your truck is throwing exhaust codes, failing an emission inspection, showing signs of an exhaust leak, or due for a clean truck check, our East 23rd Street shop handles the full scope of work in-house — fast, honest, and at fair prices. Call (317) 292-8500 to schedule a same-day diagnostic.
Exhaust and emissions problems often surface gradually. Catching them early prevents costlier engine and aftertreatment damage down the line. Watch for these signs on your diesel truck:
If your truck is showing any of these symptoms, call Paul's Repair Shop at (317) 292-8500 for a fast diagnosis. Ignoring exhaust leaks or failing emissions equipment puts your operating authority, your health, and your engine at risk.
Truck exhaust repair costs vary significantly by the scope of the repair, the engine platform, and whether aftertreatment components are involved. The table below reflects typical ranges for Class 6–8 diesel trucks at Paul's Repair Shop in Indianapolis:
| Service | Parts Est. | Total Est. |
|---|---|---|
| Exhaust Leak Repair (clamp/section) | $50 – $400 | $150 – $700 |
| Muffler Replacement | $200 – $800 | $350 – $1,200 |
| Catalytic Converter / DOC Replacement | $800 – $3,500 | $1,100 – $4,500 |
| Exhaust Manifold Replacement | $400 – $1,200 | $700 – $2,200 |
| Flex Pipe / Bellows Replacement | $100 – $400 | $200 – $700 |
| Emission Repair After Failed Inspection | Varies by fault | Quote on inspection |
Note: Costs vary by truck make, engine platform, and parts availability. Call (317) 292-8500 for a written estimate specific to your truck before any work begins.
We perform exhaust and emissions repair on a wide range of commercial diesel trucks, including:
Not sure if we cover your application? Call (317) 292-8500 and we'll confirm before you make the trip.
Our exhaust and emissions service covers the complete system — from the exhaust manifold and turbocharger outlet through the aftertreatment stack.
| Service Included | What We Do | Avg. Time |
|---|---|---|
| Exhaust Leak Diagnosis & Repair | Pressure-test and visual inspection of all exhaust joints, flex pipes, manifold gaskets, and clamps. Weld, reseal, or replace leaking sections to restore a tight, compliant system. | 1–3 hrs |
| Muffler Replacement | Remove failed or damaged muffler and install a direct-fit OEM-spec replacement. Includes inspection of surrounding hangers, straps, and isolators. | 1–2 hrs |
| Catalytic Converter Service | Inspect, clean, or replace diesel oxidation catalyst (DOC) and catalytic converter units. Address underlying fuelling or oil contamination issues that cause premature converter failure. | 2–4 hrs |
| Emissions Testing & Inspection | On-site emissions diagnostic using scan tool live data and exhaust gas analysis. Identify fault codes, pinpoint the root cause of failed emission inspections, and produce a written repair estimate. | 30–60 min |
| Exhaust Manifold Repair | Inspect and replace cracked or warped exhaust manifolds and gaskets. Address turbocharger inlet leaks that cause boost loss and exhaust backpressure faults. | 3–6 hrs |
| Flex Pipe & Bellows Replacement | Replace deteriorated flex sections that absorb engine movement. Failure allows exhaust gases to escape near the cab, creating a serious carbon monoxide risk. | 1–2 hrs |
| Emission Repair After Failed Inspection | Review inspection failure report, diagnose the root cause, perform required repairs, and re-verify compliance. Written documentation provided for re-inspection. | Varies |
| Clean Truck Check Preparation | Pre-inspection review of DPF, DOC, SCR, EGR, and exhaust system integrity to identify and correct issues before your scheduled Clean Truck Check. | 1–2 hrs |
Pressure-test and visual inspection of all exhaust joints, flex pipes, manifold gaskets, and clamps. Weld, reseal, or replace leaking sections to restore a tight, compliant system.
Remove failed or damaged muffler and install a direct-fit OEM-spec replacement. Includes inspection of surrounding hangers, straps, and isolators.
Inspect, clean, or replace diesel oxidation catalyst (DOC) and catalytic converter units. Address underlying fuelling or oil contamination issues that cause premature converter failure.
On-site emissions diagnostic using scan tool live data and exhaust gas analysis. Identify fault codes, pinpoint the root cause of failed emission inspections, and produce a written repair estimate.
Inspect and replace cracked or warped exhaust manifolds and gaskets. Address turbocharger inlet leaks that cause boost loss and exhaust backpressure faults.
Replace deteriorated flex sections that absorb engine movement. Failure allows exhaust gases to escape near the cab, creating a serious carbon monoxide risk.
Review inspection failure report, diagnose the root cause, perform required repairs, and re-verify compliance. Written documentation provided for re-inspection.
Pre-inspection review of DPF, DOC, SCR, EGR, and exhaust system integrity to identify and correct issues before your scheduled Clean Truck Check.
Paul's Repair Shop is centrally located on the east side of Indianapolis, making it one of the most accessible heavy truck exhaust repair facilities in central Indiana. Our shop at 5284 E 23rd St is a short distance from I-70, I-465, and I-65 — meaning most trucks running major freight corridors through Indiana can reach us without a significant detour.
We provide exhaust system repair and emission inspection services for owner-operators, small fleets, and regional carriers across:
Exhaust and emissions faults rarely exist in isolation. These related services address the root causes and downstream effects:
| Service | Why It Connects to Exhaust & Emissions |
|---|---|
| EGR & DPF System Service | EGR cooler failure and DPF blockage are the leading causes of emissions fault codes. Addressing both systems together resolves the root cause rather than treating symptoms. |
| DPF Cleaning & Repair | A clogged DPF increases exhaust backpressure, elevates exhaust temperatures, and stresses the turbocharger. DPF service often accompanies exhaust system repair. |
| Turbocharger Repair & Replacement | Exhaust manifold leaks reduce turbocharger inlet pressure, causing boost deficiency codes and long-term bearing damage. Repairing the exhaust leak protects the turbo. |
| Diesel Engine Diagnostics & Repair | Many emission inspection failures originate from engine fuelling or combustion issues. A full engine diagnostic identifies problems before they cascade into aftertreatment damage. |
| DOT Inspections | A truck with exhaust defects is an automatic out-of-service violation in a DOT inspection. Exhaust repair restores compliance before your next inspection date. |
| Fleet Maintenance Services | Fleet accounts benefit from scheduled exhaust and emissions checks as part of a preventive maintenance plan, reducing unexpected downtime and inspection failures. |
Don't let an exhaust leak, a failed emission inspection, or an upcoming Clean Truck Check put your truck out of service or your operating authority at risk. Paul's Repair Shop in Indianapolis provides fast, reliable heavy truck exhaust repair and emissions service backed by more than a decade of diesel expertise. Request a free estimate online or call (317) 292-8500.
