MBRP 15.5-16 GM Duramax 6.6L 3in Down Pipe Kit

MBRP 15.5-16 GM Duramax 6.6L 3in Down Pipe Kit

Marsoni

M251S

$147.50

Get it in 3 business days with 1 day shipping. Friday, May 29

MBRP 15.5-16 GM Duramax 6.6L 3in Down Pipe KitReplace that restrictive factory downpipe with a MBRP direct replacement downpipe for more flow, fuel economy, and better performance. Removal of OEM catalytic converters may be a violation of emissions laws in your jurisdiction. Ensure that the intended use of this product is permitted. Not for sale or use in the state of California. Installation Instructions Installation Instructions Warranty This Part Fits: Year Make Model Submodel 2015 2017

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The looks are very nice, functional if left alone once assembled. After that I would leave them alone otherwise you risk the main male portion just coming loose of the housing, sound quality is decent, nothing to write home about, but again, not very durable. If they could fix that 1 thing, these would be very good buy and value, the rest of each plug is hefty and well made.

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Reviewed in the United States on January 12, 2026

Verified Purchase

Amazon Customer

Lowell, US

★★★★★ 5

Fixed my over temp warning issue.

Easy to change and work like new. No more over temp warning at idle.

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Reviewed in the United States on June 9, 2025

Verified Purchase

Michael Rhodes