Spelab

3.5-Inch Turbo Downpipe

$228.00

SKU: SPES08074-ES08679S5.0

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Spelab 3.5-Inch Turbo Downpipe Exhaust is engineered to optimize performance for 2017-2025 L5P Duramax 6.6L diesel engines. By replacing the restrictive factory downpipe, this component allows the turbocharger to operate more efficiently, leading to reduced turbo lag and improved throttle response. Its larger 3.5-inch diameter facilitates faster exhaust gas exit, minimizing backpressure and enabling the turbo to spool quicker and generate more power. The design effectively eliminates factory restrictions, serving as a crucial foundation for further performance modifications such as tuning and increased boost levels. This downpipe is specifically designed for Chevrolet Silverado & GMC Sierra 2500 & 3500HD models from 2017-2025 with the 6.6L Duramax engine. Please note that it will not fit Cab & Chassis truck configurations.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSpelab
Part NumberSPES08074-ES08679S5.0
CategoryExhaust

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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