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01-06-2010, 02:08 AM
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Sandtrap Motorsport
Join Date: Nov 2005
Location: Perth
Posts: 1,216
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ive been told theres a 40mm exhaust restriction in the XR4's exhausts from factory.
but its not visible from the exterior of exhaust, as its 60mm O.D. with 40mm I.D. looking to get this cut out and some exhaust flexi-pipe put in its place. does anybody have an exact position of where this is in the exhaust system? before Cat? after cat? etc cheers
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'71 Ford Capri -- 510rwkw Barra powered Capri - new race engine being built Sandtrap Motorsport's BF XR6T wagon -- to tow around the Capri ^^^ www.facebook.com/SandtrapMotorsport |
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01-06-2010, 07:38 AM
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Finally rollin on 20's
Join Date: Sep 2005
Location: Brisbane
Posts: 1,949
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I think you will find the flexi is the restriction, as this is the bit they get changed first!
Cheers
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Fiesta ST..... Colorado Red...... SOLD Territory Turbo Ghia ..... Winter White SOLD - Good bye my little buddy!!!! K&N, F6 Snorkel, Debung, 20" Enix Turbine in Gunmetal, 7 seat rear springs. |
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01-06-2010, 09:14 AM
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FF.Com.Au Hardcore
Join Date: May 2006
Location: Brisbane
Posts: 1,053
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The Flexi Pipe itself is the restriction, it has an internal diameter of 40mm whereas the rest of the exhaust is 60mm ... Ford deliberately did this to keep the car under 150hp to cater for the stict Insurance regulations in some European Countries hence allowing it's target market to actually purchase the car.
Replacing the stock Flexi Pipe with an aftermarket one with a 60mm internal is one of the most common modifications done to the Fiesta ST/XR4. Probably the most popular make people buy is the Miltek one available over the net from European and UK sites such as .. http://www.european-parts.net/catalo...roducts_id=444 I believe Best Mufflers in Sydney also makes a good aftermarket one for the XR4, a few of the guys that have purchased them have been very happy ... here's a link to a thread about them .. http://www.fordxr4.com/forum/index.php/topic,730.0.html |
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XR4 exhaust restriction
Linear Mode
