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Exhaust› Catalytic Converters

RENNtech

Sport Catalytic Converter Downpipes

$4,380.00 $4,215.75 Save $164.25

SKU: 49.177.0373

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The RENNtech downpipes are a high-performance exhaust upgrade featuring 200-cell sport catalytic converters. Constructed from T304 high-strength stainless steel, these components are designed to improve exhaust flow, reduce back pressure, and increase initial turbo spooling.

These downpipes are manufactured at the RENNtech headquarters in Stuart, Florida, and include all necessary mounting hardware and clamps for installation.
Show original supplier description
By reducing exhaust back pressure, these stainless steel units enhance throttle response, increase initial turbo spooling, and provide a more aggressive exhaust sound output. They are constructed from high-strength T304 stainless steel and feature integrated 200-cell sport catalytic converters for an optimized balance of flow and filtration. Compatibility is specific to the 4.0L V8 BiTurbo M177 engine found in W205 C63 and C63 S sedan models, C205 C63 and C63 S coupe models, and X253 GLC63 and GLC63 S SUV/coupe models. Note that these downpipes are intended strictly for motorsport applications on closed-circuit racetracks or for export purposes. They are not intended to be installed on vehicles for use on public roads in the United States.

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

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandRENNtech
Part Number49.177.0373
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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