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Milltek catted hi-flow downpipe (Milltek cat-back) for the Mustang EcoBoost S550

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Milltek catted hi-flow downpipe (factory cat-back) for the Mustang EcoBoost S550

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Milltek catless downpipe (Milltek cat-back) for the Mustang EcoBoost S550

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Milltek catless downpipe (factory cat-back) for the Mustang EcoBoost S550

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Milltek Sport Catted & Catless Downpipes - 2015-2017 Mustang EcoBoost

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Brand: Milltek SportSKU / Part #: SSXFD172

Regular price: $488.75
Regular price: ~~$575.00~~
Sale price: $488.75
Unit price: per

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Subtotal: $488.75

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Milltek Sport Catted & Catless Downpipes - 2015-2017 Mustang EcoBoost

Subtotal: $488.75

Not sure it fits? Text us your VINSee all fitment

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Overview

These Milltek Sport parts fit the 2015-2017 Ford Mustang EcoBoost fastback (S550) with the 2.3 liter turbo four. A larger downpipe is the most common hardware upgrade for a tuned EcoBoost Mustang, since it lets the turbo flow more freely. Each option is labeled by catalytic converter type and by the cat-back it joins.

How to Choose

Choose the Part you need. Catless Downpipe (Milltek Cat-Back) has no catalytic converter. It is for off-road and track use only and needs an ECU remap, and it connects to a Milltek cat-back. Catless Downpipe (Factory Cat-Back) has no catalytic converter. It is for off-road and track use only and needs an ECU remap, and it connects to the factory cat-back. Catted Hi-Flow Downpipe (Milltek Cat-Back) keeps a high-flow sports catalytic converter. Milltek recommends an ECU remap with it, and it connects to a Milltek cat-back. Catted Hi-Flow Downpipe (Factory Cat-Back) keeps a high-flow sports catalytic converter. Milltek recommends an ECU remap with it, and it connects to the factory cat-back.

Pair them with the Milltek cat-back for the Mustang EcoBoost S550 for a complete Milltek exhaust.

Features

70 mm (2.76 in) T304L stainless steel pipework
Mandrel-bent and made to bolt to the factory mounting points
Catted and catless options explained in How to Choose

What's Included

The Milltek parts shown for the version you choose

Specifications

Spec	Value
Brand	Milltek Sport
Part numbers (MPN)	Catless Downpipe (Milltek Cat-Back): SSXFD172. Catless Downpipe (Factory Cat-Back): SSXFD171. Catted Hi-Flow Downpipe (Milltek Cat-Back): SSXFD169. Catted Hi-Flow Downpipe (Factory Cat-Back): SSXFD170
Type	Downpipe
Material	T304L stainless steel
Pipe diameter	70 mm (2.76 in)
Race product	Yes, per Milltek. For off-road and track use

Fitment Notes

Fits the 2015-2017 Mustang EcoBoost fastback. The 2018-2023 facelift has a different rear valance; please call us to confirm before ordering for it.
Not for the convertible.
Catless parts remove the catalytic converter. They are sold for off-road and competition use only and are not legal on public roads in the US.

Questions about fitment? Call (310) 231-0292 or text (310) 886-3111.

Year	Make	Model	Chassis	Engine
2015-2017	Ford	Mustang EcoBoost Fastback	S550	2.3L EcoBoost I4 Turbo

Fitment

Year	Make	Model
2015–2018	Ford	Mustang EcoBoost

Not sure? Text us your VIN and we’ll confirm.

Shipping & returns

Shipping: Orders ship via UPS, FedEx or USPS, from our facility near Los Angeles or directly from the manufacturer. Rates for many items are weight-based and shown at checkout. If you need it by a certain date, text us before you order.

Returns: Unused items in brand-new condition and original packaging can be returned within 30 days of the invoice date, with a 25% restocking fee unless otherwise specified. In some cases we can offer a lower fee with the balance as store credit. Shipping charges aren't refundable in either direction unless approved by AutoTalent.

Not returnable: special-order or custom items, and anything that has been installed, modified or altered.

Cancellations: free if the item is out of stock or we miss the ETA you agreed to. Other cancellations carry a 5% processing fee to cover card fees we can't recover. Special-order items can't be cancelled.

Damaged in transit? Report it to the carrier and to us within 48 hours, keep all packaging, and don't send anything back without our written approval.

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