Throttle Response Controller

One of our top recommended mods for those
looking to improve the performance and response!

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The most advanced Plug and Play Performance Module available for your Jaguar.

Designed to outperform all other Plug and Play Performance Modules or your money back!

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Improve throttle response and eliminate throttle lag.

Find out why this is one of the best selling and reviewed upgrades available for your Jaguar.

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Increase performance with faster gear shifts on your Jaguar with the AutoFlash by MADNESS!

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Who We Are

JAG MADNESS is part of the MADNESS Autoworks family which is your One Stop Shop for customizing, accessorizing and servicing your favorite ride.

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Upgrade your Jaguar
with Carbon Fiber

Browse Carbon Fiber

Improve the performance
and sound of your Jaguar

The Best Air Filters
for your Jaguar!

Shop BMC Filters Shop Sprint Filters

Give your Jaguar the sound it deserves with these

Performance Exhaust Systems.

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See what people have to say

I love all of my MADNESS products in both of our Jaguars. Also, I wanted to tell you, I have the new facelift (2021) F-Type R & the Carbon fender trim fit perfectly. All of our E-Pace interior carbon trims fit like a glove and we're proud to purchase from an American company.

Thank you MADNESS, we appreciate the terrific products!

Dr. JH

The carbon fiber side skirts look great on my F type. The quality is great the carbon weave looked perfect and I am very please. They are comparable to other manufacturers but the curved design is spectacular.


...thanks again for all your help! You are always great and you guys have earned all of my business! I just paid via PayPal so you should be all set.

Sean M

This is the definite one-stop shop for anything you want or need to put AND keep your car in tip-top shape!

Khalil Williams

MADNESS GOPedal - It is an amazing upgrade! Thank you guys you are the best.

Cristiano Minchio

Special thanks to Justin is a super leader in customer service, A + + + +. Thanks again and look forward to doing business with you.

Jose Aponte

I just wanted to Compliment You for the EXCELLENT SERVICE. I received an e-mail this morning indicating my parts had shipped. @2:00 this afternoon there they are at my front door!!! That is FANTASTIC ! You have a Customer for Life.

Bob Powell

Thank you very much Art. Your help has been top class man. I will definitely refer you to anyone who may be looking for something.

Joe De Vivo

It was great meeting everyone in your shop. Keep up the good work. Your shop and service is top notch.

Gerald Johnson

IMO, the service is top end all the way, and the product I bought is absolutely awesome!

C Thrasher

I couldn't be more pleased. Thanks to you, Rachel, John, Joseph, and the entire team! I walked out with a brand new car.


Wish I had your Customer Service Department where I work. You guys are GREAT.

Charles Matthai

I can’t express the appreciation of customer service enough. Going straight to you guys for everything going forward the middle men constantly drop the ball.

Nick Roman

Your One Stop Shop!

High quality parts, accessories, installation and customizing services.

Whether you are looking for performance parts, handling upgrades, interior/ exterior accessories or other custom modifications we are your shop.
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Don't see an item online?

If there is an item you need, but you do not see it in our online store, contact us directly!

Bottom line, if you don't see it, please contact us directly and we will be glad to assist.
Contact Us

Lowest Price Guarantee

We won't be beat! Found it for less? We'll beat it!

We offer the best products at the best price available on every item in our store.

Local Installation & Customization

We operate full service facilities in the Los Angeles, CA and Austin, TX area.

Need installation, customization or service assistance? We'll be glad to help!
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Accessorizing your ride has never been easier than with MADNESS!

We work with 100's of manufacturers and stock 1,000's of accessories. Whether you need performance parts, new wheels / tires or something as simple as a set of Custom Floor Mats we have it all. If there is something special that you are looking for that we do not stock, have no fear! We can source just about any part or accessory for you. In addition, we have a Lowest Price Guarantee and offer installation on premises.

Customize your ride!

We have customized 100's and 100's of cars for company promotion, celebrities, TV shows, car collectors, and most importantly enthusiaists like you. We can assist you with something as simple as installing a Custom Exhaust System or fully transforming your stock vehicle to a real head turner.

Set you Jag apart from the crowd

Let us know the theme or look you are going for or allow us to suggest some options. We will work with you to design a concept that will allow you to visualize what your car "can" look like. If you like what you see, we have the means and the knowledge to take it from concept to reality. Our work has been and continues to be featured on a number of TV Shows, Online Media, Print Media and at Car Shows all over the country. Let us help you personalize your favorite ride. Our goal at JAG MADNESS is to deliver on time, on budget and in a condition that exceeds your expectations!
Our goal is to provide you, our fellow enthusiasts with the very best in products and services at reasonable prices with a personal touch. Shop Now

Two locations to serve you


22108 SH 71 W.
Spicewood, TX 78669
Mon-Fri: 9 AM - 6PM CST
Sat-Sun: Closed


2716 Dawson Ave.
Signal Hill, CA 90755
Mon-Fri: 9 AM - 6PM PST
Sat-Sun: Closed