Pypes Mustang GT Catted H-Pipe (1999-2004)

$127.82 (15%)
Pypes HFM36 catted x-pipes are a direct fit for 99-04 Mustangs and made from T409 stainless steel. They are a 49 state street legal emission complaint part.

Part Number: 669 HFM36
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Mustang specific fitment. Pypes catted h-pipes are a direct replacement for 1999-2004 4.6L Mustang GT's with either factory or aftermarket shorty headers and a dual cat-back exhaust. Oxygen sensor bung's are located in the OE position to ensure correct air/fuel ratio measurements as well as OBD2 catalyst efficiency monitoring. For 2004 applications the O2 sensors are relocated and require 24 inch extended wires. 

49 state legal. Pypes catalytic converters are EPA complaint construction and legal in most states depending on county or city emission testing regulations. This assembly in not legal in California due to CARB emission regulations. 

Quality construction. Pypes h-pipe assemblies are built from 16-gauge, mandrel bent, 2.5 inch diameter, T409 stainless steel to withstand the toughest road conditions. T409 exhausts are a great choice for people, as it is a more budget friendly option but can still withstand inclement weather. It will develop surface rust over time, but it will not rust through. 

H-pipe sound and performance. Due to their low restriction cats and mandrel bent tubes, this piece will increase horsepower especially if your 2 valve has power adders installed. The H-pipe crossover is meant to increase low end power and will produce a deeper muscle car rumble at idle.

Fitment Note. Does not fit Cobra 4.6L 4V models. 

Features & Benefits:

  • Increased HP
  • Deep tone at idle
  • T409 stainless
  • 49 state legal
  • Direct fit
This part is not approved for sale in California or states that require a California E.O. # and is intended for off-road and competition use only. Installation of this part on a vehicle that is driven on public roads may violate U.S. laws and/or regulations. It is the responsibility of the customer to determine if their modified vehicle complies with applicable laws. For more information, please visit our Terms & Conditions page.

CA Residents: Cancer and Reproductive Harm WARNING

Fitment & Features


Manufacturer: Pypes

Vehicle Fitment:

Fits Model Year: 1999, 2000, 2001, 2002, 2003, 2004
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