Extreme Matrix Subframe System for 1979-2004 Mustang and Cobra

Extreme Matrix Subframe System for 1979-2004 Mustang and Cobra
Installed Red Extreme Matrix KitFull view of installed Exteme Matrix Kit.
Silver Anniversary Edition
Price: $459.00
SKU: KB-29550
Weight: 46 lb.
Calculated at checkout

2015-2018 Mustang, GT350

JRZ Shocks and Struts

Street And Track Performance

"Just Released" 

Kenny Brown New Triple Pass Radiator 


The Extreme Matrix Kit

The Ultimate in Under Car Chassis Support

  • Stiffens the chassis, improving ride quality and handling
  • A MUST for all convertibles and hard driving applications
  • Helps reduce squeaks and rattles
  • Creates a full frame under your Mustang
  • No loss of ground clearance
  • Built-in jacking rails for added convenience

The Extreme Matrix Kit improves the ride quality and handling of your Mustang by maximizing the strength of the car's center pan section, with minimum additional weight and no loss in ground clearance. The Extreme brace “bridges” the Kenny Brown Subframe Connectors** and Jacking Rails to form a triangulated 12” wide frame on each side of your Mustang. Finished in OE-quality silver-zinc chromate for rust protection.

KB-29550 Fits 1994-2004 Mustang GT, V6 & Cobra* (kit includes KB-29004, KB-28010, KB-28019)

KB-29551 Fits 1979-1993 Fox Mustang GT, V6 & Cobra (kit includes KB-29004, KB-28009, KB-28019)

KB-29552** Fits 2005-2012 Mustang, GT500 (kit includes KB-28009, KB-28029 – note: does not include 29004)

* 96-98 Cobra - Subframe Connectors must be modified by shortening slightly.

**2005-2012 Mustangs, GT500 do not need subs to install Extreme Matrix Brace.


Kenny Brown Performance addresses potential warranty issues in the engineering process by using only the highest grad components available and engineering them to reduce the potential for failures and warranty issues.  All Kenny Brown components are thoroughly inspected, tested, and approved prior to release to the customer.  As with any mechanical creature, occasionally warranty issues arise.  If you experience a warranty or fitment issue, please contact Kenny Brown Performance customer service at 855.847.4477.  Any shipping charges that are incurred due to the result of a warranty issue is the responsibility of the customer, not Kenny Brown Performance.

Kenny Brown Performance is not responsible for any loss, damage or injury resulting from direct or indirect use of our products or other manufacturers’ products, or the inability of purchaser to determine proper use, application or installation of our product.

Other Manufacturer’s Products

Kenny Brown strives to use only the best available components in the conversion process. These brand name components carry warranties from their respective manufacturers  with the warranty by the manufacturer extended to the purchaser.  We will be happy to assist in obtained fulfillment  of a manufacturer’s warranty.  Other than applicable manufacturer’s warranties, there are no warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose. The entire risk as to the quality and performance of such parts is with the buyer.

Kenny Brown Performance Manufactured Products

In an effort to maintain the high level of customer service Kenny Brown products are known for, Kenny Brown offers a limited warranty. Due to the use of and nature of high performance vehicles, all warranty issues are evaluated on an individual basis.  Kenny Brown Performance, at its sole discretion, will determine the validity of each warranty.  Kenny Brown will do its utmost to ensure satisfaction to its customers and assist in seeking resolutions in such matters.  Kenny Brown Performance has no control over the use, misuse, neglect, abuse or incorrect installation and servicing of said components, parts or vehicles.  Other than the above stated warranty, there are no warranties, express or implied, including any warranty of merchantability or fitness for a particular purpose. Implied warranties, including warranties of merchantability or fitness for a particular purpose, are excluded.  The entire risk as to the quality and performance of such parts is with the buyer.

Competition Products

Competition parts are sold “as is” without any warranty whatsoever.  Implied warranties, including warranties of merchantability or fitness for a particular purpose, are excluded.  The entire risk as to the quality and performance of such parts is with the buyer.  Should such parts prove defective following their purchase, the buyer and not the manufacturer, distributor or retailer, assumes the entire cost of all necessary servicing or repair.

Kenny Brown Performance warranty on its cars and parts, along with Car Manufacturers’ warranty on its vehicles, is voided if the vehicle or parts are used for competition or if they fail as a result of modification.  Installation of some components may affect car manufacturers’ warranty and Kenny Brown Performance warranty.


Kenny Brown Performance has a philosophy of offering top quality customer service before, during and after the sale.  Our technical assistance is available during regular business hours to answer questions on Kenny Brown products and assist with installation questions.  Feel free to contact our Technical Assistance department at 855.847.4477.


All prices, descriptions, specifications, and part numbers are subject to change without notice.  Notification of price increases will be given prior to shipment.


Kenny Brown Performance requires all purchases to be paid for before shipment or delivery.  For your convenience we accept Visa, Mastercard, American Express, and Discover credit cards, along with debit cards, cashers checks and money orders. It is our policy to charge your credit card  the day the item is shipped unless it is a special order product and you will be informed at the time of sale. 


If you need to return or exchange an item, please call Kenny Brown Performance customer service department at 855.847.4477 for a Return Goods Authorization (RGA) Number.  We accept returns within 30 days of delivery.  All merchandise must be new and in resaleable condition, and must be issued an RGA number.  The RGA number must be clearly marked on the outside of the package and the product must be returned freight prepaid.  Special Order, discontinued, or non-stock items are not returnable.


Credit amount will be calculated as follows:  Credit less 15% restocking fee and less all freight charges incurred.   Returns missing pieces or hardware will be charged accordingly.  Credits will be issued to the credit card used on the order.  If payment received was cash or check, we will refund by check to the billing address. The merchandise should be completely repackaged in the original packing material for the return inspection.  All original packaging material must be returned along with the merchandise.  Your credit depends upon these steps being followed carefully.


Please inspect your shipment immediately upon receipt.  If your shipment has arrived damaged, please contact the shipping company directly within five working days.  All shipments are F.O.B. Wauconda, IL.  If your shipment has been shorted, contact Kenny Brown Performance customer service department at 855.847.4477 within five working days. 


Because some U.S., Canadian, State or provincial laws and regulations may prohibit removal or modifications of components that were installed on OE Manufacturers’ vehicles to meet emission requirements or to comply with motor vehicle safety regulations applicable to vehicles manufactured for use on public roads, Kenny Brown Performance recommends that vehicles equipped with parts designated “for off-highway use” not be operated on public roads, and offers such parts only for track or off-highway competitive or performance use and does not guarantee compliance with these state laws and regulations.  In California, these parts may legally be used only on a racing vehicle which will never be operated on public roads.  In addition, installation of this part may adversely affect the warranty coverage of your vehicle.

Perfect Addition to an SN95 Chassis

To create a solid platform on which to build, this was the very first chassis/suspension modification for my car over. That was over 10 years ago.

Since that time, I have remained completely satisfied with the product. The Extreme Matrix has continued to minimize chassis flex and improve torsional rigidity in my '01 Cobra convertible without adding a lot of weight.


Posted by Taz (not verified)

matrix kit!

This kit is great! Install is ok, kit didnt fit perfect but every car is just a bit diferent.  I have a 03 Cobra with 590rwhp.  This kit was a MUST for me and it made a huge difference.  I would recomend this kit for any vert and also any coupe with big horsepower.

Posted by Drew Smith (not verified)