Description
Product Overview
Maximize your 2011–2015 Chevrolet/GMC Duramax LML's exhaust flow with the iFJF 4" DPF & CAT Delete Pipe (No Muffler). This straight-through race pipe eliminates both the restrictive diesel particulate filter and catalytic converter, replacing them with a mandrel-bent 4-inch T409 stainless steel system that unlocks your 6.6L's hidden power and fuel economy potential.
Key Features
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T409 Stainless Steel — 2mm wall, corrosion resistant, magnetic (unlike T304)
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4.0" Mandrel-Bent Tubing — Computer-controlled bends for unrestricted flow
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Straight Pipe / Race Pipe Design — Maximum volume, maximum performance
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V-Band Clamp Fitment — Fits 2011–2015 LML models only
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Factory Hangers Pre-Welded — True bolt-on, no welding or fabrication
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TIG Welded Joints — Pressure tested, guaranteed leak-free
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Includes All Hardware — Clamps, bolts, hangers included
Vehicle Compatibility
| Year |
Make |
Model |
Engine |
| 2011–2015 |
Chevrolet |
Silverado 2500HD / 3500HD |
6.6L Duramax LML |
| 2011–2015 |
GMC |
Sierra 2500HD / 3500HD |
6.6L Duramax LML |
⚠️ NOT Compatible With: 2015.5–2016 models (3-bolt flange), Cab & Chassis trucks. Verify V-band clamp connection at turbo before ordering.
Performance Gains
| Metric |
Stock (DPF Restricted) |
After Delete |
| Fuel Economy (Combined) |
13–14 MPG |
18–19 MPG |
| Exhaust Gas Temperature |
Elevated |
200–300°F Lower |
| Turbo Spool |
Delayed |
Immediate / Faster |
| Exhaust Tone |
Muted |
Loud, Aggressive Race Tone |
Frequently Asked Questions
Q: How do I know if I have V-band or 3-bolt flange?
A: Look where the downpipe connects to the turbo outlet. A V-band clamp uses a single large ring clamp. A 3-bolt flange has three separate bolts in a triangular pattern. 2011–2015 (early) = V-band. 2015.5–2016 = 3-bolt.
Q: Will this fit Cab & Chassis trucks?
A: No. Cab & Chassis (commercial style) trucks have a different frame and exhaust routing. This is for pickup trucks only.
Q: Is T409 stainless steel magnetic?
A: Yes — unlike T304, T409 stainless is magnetic. This is normal. A magnet test does NOT mean it's not real stainless steel.
Q: Is this loud without a muffler?
A: Yes, this is a straight pipe. Expect a significantly louder, more aggressive exhaust note. If you want a quieter tone, see our muffler version (DP-0275).
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