MBRP S6005PLM LB7 Duramax 4" Aluminized Exhaust | No Muffler

01-04 GM LB7 6.6L Duramax MBRP 4" Aluminized Downpipe Back Single Side Exit Exhaust System

MBRP S6005PLM — 4" Aluminized No-Muffler Downpipe-Back Exhaust for 2001-2004 LB7 Duramax

$459.99

Part Number: S6005PLM
Est. Ship Time: Contact To Confirm Availability

MBRP

Qty

Add to Cart

Ask Question

Add to Wish List

SSL SECURE
TRANSACTION

AUTHENTIC
PRODUCTS

GUARANTEED PREMIUM
QUALITY

A+ Rating

Based on 0 reviews. - Write a review

Shipping Restriction
If your delivery address is in California or Colorado, this item cannot ship there. Provide an eligible out-of-state delivery address before ordering.

The MBRP S6005PLM is a 4-inch aluminized steel no-muffler downpipe-back exhaust system for 2001-2004 Chevy/GMC 6.6L LB7 Duramax trucks. It fits Extended Cab and Crew Cab configurations only — regular cab trucks may require custom modifications. Built from 16-gauge Armor Lite aluminized steel with a Street Profile sound tune and no muffler. This is a downpipe-back system — the turbo downpipe is not included. Buyers who want a muffler should see the S6005P. Buyers who want stainless should see the S6005SLM. Buyers who want a 5-inch no-muffler system should see the S60210PLM.

Buy this if...

You have a 2001-2004 LB7 Duramax in Extended Cab or Crew Cab configuration and want a 4-inch no-muffler downpipe-back system.
You want more exhaust volume than the muffler-equipped S6005P while staying with aluminized steel at a budget-friendly price.

Do not choose this if...

Your delivery address is in California or Colorado — this item cannot ship to those addresses.
You want a muffler for highway comfort — see the S6005P instead.
You want T409 stainless for road salt or wet climates — see the S6005SLM instead.
You want a 5-inch no-muffler system for more volume — see the S60210PLM instead.
You have a 2004.5 or newer LLY Duramax — this system fits LB7 only.
Your truck is a Regular Cab — this system fits Extended Cab and Crew Cab only.

Verify before ordering...

Your truck is a 2001-2004 LB7 Duramax, not a 2004.5 LLY — confirm using the 8th VIN digit check below.
Your cab configuration is Extended Cab or Crew Cab, not Regular Cab.
You want a no-muffler system.
You understand the turbo downpipe is not included in this system.
Your delivery address is not in California or Colorado.

LB7 or LLY? Check your 8th VIN digit before ordering.
Some 2004 trucks are LB7 and some are LLY — they require different exhaust systems. Check the 8th digit of your VIN:
8th digit = 1 → Early 2004 LB7 — this system fits.
8th digit = 2 → 2004.5 LLY — this system does not fit. Browse the LLY exhaust category instead.

Downpipe-Back System — Turbo Downpipe Not Included
The S6005PLM is a downpipe-back system. It mounts from the factory downpipe outlet rearward and does not include the turbo downpipe itself. If you also need a new turbo downpipe, see the GM8425 performance downpipe or the LB7 exhaust category for all downpipe options.

Part Number: S6005PLM

Series: Armor Lite

Material: 16-gauge aluminized steel

Diameter: 4 inch

Muffler: Not included

Sound Profile: Street Profile

Warranty: 1 year

Cab Fitment: Extended Cab and Crew Cab only — Regular Cab may need modifications

Turbo Downpipe: Not included — downpipe-back system only

Fits: 2001-2004 LB7 Duramax (not LLY)

Does Not Ship To: California or Colorado delivery addresses

Which LB7 Downpipe-Back System Is Right for You?

The S6005PLM, S6005P, and S6005SLM cover the same 2001-2004 LB7 EC/CC fitment in 4-inch. The PLM is the no-muffler aluminized option — more volume than the muffler-equipped S6005P at a price suited to dry climates. The SLM adds T409 stainless for a typically longer service life. Step to S60210PLM for the loudest aluminized option. None of these systems include the turbo downpipe.

System	Diameter	Material	Muffler	Sound Profile	Best Suited For
S6005P	4 inch	Aluminized	Yes	Street Profile	Daily driver, towing, refined note
S6005PLM (this page)	4 inch	Aluminized	No	Street Profile	More volume, aluminized budget
S6005SLM	4 inch	T409 stainless	No	Street Profile	Road salt, typically longer service life
S60210P	5 inch	Aluminized	Yes	Street Profile	Deeper tone with muffler, more flow
S60210PLM	5 inch	Aluminized	No	Race Profile	Loudest aluminized option
S60210SLM	5 inch	T409 stainless	No	Race Profile	Stainless durability, Race Profile sound

On a 2004.5 or newer LLY Duramax, browse the LLY exhaust category for the correct system. View the full MBRP exhaust lineup for all platforms.

Avoid These Common Mistakes

Expecting the turbo downpipe to be included: The S6005PLM is a downpipe-back system and does not include the turbo downpipe. If you also need a turbo downpipe, see the GM8425 performance downpipe.
Expecting a muffler: The S6005PLM does not include a muffler. For a muffler-equipped 4-inch system, order the S6005P instead.
Ordering for a Regular Cab truck: Designed for Extended Cab and Crew Cab trucks only. Regular cab may require custom modifications.
Ordering for a 2004.5 LLY: Check the 8th digit of your VIN — a 1 is LB7, a 2 is LLY. This system fits LB7 only.
Shipping to a California or Colorado delivery address: If your delivery address is in California or Colorado, this item cannot ship there. Provide an eligible out-of-state delivery address before ordering.

Before You Order

Truck is a 2001-2004 LB7 Duramax — 8th VIN digit is 1, not 2.
Cab configuration is Extended Cab or Crew Cab — not Regular Cab.
You want a no-muffler system.
You understand the turbo downpipe is not included — only the downpipe-back system.
Delivery address is not in California or Colorado.

If all five of those apply, the MBRP S6005PLM is the appropriate system for your LB7. If any one does not apply, use the routing table above or contact Pure Diesel Power before ordering.

Ordering Help
Not sure between the no-muffler S6005PLM and the muffler-equipped S6005P, or whether to go 4-inch or 5-inch, aluminized or stainless? Also need to confirm your cab style, delivery address, or whether you need a turbo downpipe too? Contact Pure Diesel Power before ordering.

Frequently Asked Questions

Click or tap a question below to expand the answer.

Does the S6005PLM include a muffler?

No — the S6005PLM does not include a muffler. If you want a muffler-equipped 4-inch system, order the S6005P instead.

Does this system include the turbo downpipe?

No. The S6005PLM is a downpipe-back system — it mounts from the factory downpipe outlet rearward. The turbo downpipe is not included. If you also need a turbo downpipe, see the GM8425 performance downpipe or browse the LB7 exhaust category.

What is the difference between the S6005PLM and S6005SLM?

Both are 4-inch no-muffler downpipe-back systems for the 2001-2004 LB7. The S6005PLM is aluminized steel — suited to dry climates and budget builds. The S6005SLM is T409 stainless with a 5-year warranty and typically offers better corrosion resistance in road salt or wet conditions.

Should I choose the S6005PLM (4-inch) or the S60210PLM (5-inch)?

Both are aluminized no-muffler systems for the 2001-2004 LB7. The S6005PLM is 4-inch with Street Profile sound. The S60210PLM is 5-inch with Race Profile sound and more exhaust volume. Choose 5-inch if you want the loudest aluminized option available for this platform.

Should I choose aluminized or T409 stainless?

Aluminized steel (S6005PLM) is suited to dry climates and budget builds. T409 stainless (S6005SLM) typically offers better corrosion resistance and a longer service life in road salt or wet conditions, and carries a 5-year warranty.

Will the S6005PLM fit my 2004 Duramax — how do I know if I have an LB7 or LLY?

Check the 8th digit of your VIN. A 1 means early 2004 LB7 — this system fits. A 2 means 2004.5 LLY — this system does not fit. Browse the LLY exhaust category for the correct system.

Will this fit my Regular Cab LB7?

The S6005PLM is designed for Extended Cab and Crew Cab configurations. Regular cab trucks may require custom modifications. Confirm your cab style before ordering.

Can this ship to California or Colorado?

No. If your delivery address is in California or Colorado, this item cannot ship there. Provide an eligible out-of-state delivery address before ordering.

MBRP S6005PLM — 4" Aluminized No-Muffler Downpipe-Back Exhaust for 2001-2004 LB7 Duramax

Call or Text:

INFORMATION

CUSTOMER SERVICE