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LLY Duramax Downpipe

-3" stainless steel downpipe
-More HP & TQ
-Reduced exhaust backpressure
-Direct bolt-on & no tuning required
-Decreased EGTs
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Availability: In-stock, ships within 1-business day
NOTE: This product has the following shipping restriction(s):
  • This product is not available for shipping to California
Pricing: $219.00


Duramax LLY's are prone to overheating, especially when towing or when tuned. One of the best ways to reduce engine temps and EGTs is by opening the exhaust up with a higher flowing system that reduces backpressure. Backpressure acts against the turbo, making it more difficult to spool which negatively impacts turbo efficiency and creates excess heat in the engine and exhaust.

The downpipe bolts directly to the turbocharger and the factory unit is skinny and crushed which restricts exhaust flow. Since it is the first component of the exhaust system removing the restriction within the downpipe is hands down the best exhaust upgrade for the LLY. It won't provide the sound gains that a 4" or 5" exhaust system will but it will provide better heat reduction and performance gains compared to a larger exhaust system.

Our Duramax LLY Downpipe Upgrade is a 3" design that drastically increases airflow over the stock unit. It is made of 304 stainless steel to prevent any rust or corrosion and features a heat shield to minimize heat transfer. It is a direct bolt-on fitment to both the factory and aftermarket exhaust systems and doesn't require any tuning or additional modifications.

Duramax LLY Downpipe Upgrade Benefits:

  • -Increased horsepower and torque (varies depending on mods and tuning)
  • -Reduced exhaust backpressure
  • -Lower EGTs and engine temps to reduce likelihood of overheating
  • -Healthier and more reliable turbocharger
  • -Faster turbo spool
  • -Quicker throttle response

Note that our downpipe will not provide significant sound increases. If you want sound increases we suggest a 4" or 5" exhaust system which is also a great modification to further increase exhaust flow, reduce backpressure, and help prevent overheating + turbocharger issues.

Boosted Performance Downpipe Features:

  • -3" diameter, maximizes flow
  • -304 stainless steel material that won't corrode
  • -Reduced heat transfer from heat shield
  • -Direct bolt on fitment
  • -No tuning or additional modifications necessary
  • -Fits all LLY models



Shipping Information

  • Item Requires Shipping
  • 7.0 lbs.
  • W16.0000” x H7.0000” x L24.0000”
  • Free Ground Shipping Within The Continental US

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