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

The MAXPower Pro continues to be the top selling performance upgrade for FIAT vehicles.

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The best just got better!
Improve throttle response and eliminate throttle lag.
Thousands of FIAT Owners from all over the world use our MADNESS GOPedal!

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

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MADNESS Power Pack

The best performance upgrades for your FIAT and the best deal around!
Check out the new MADNESS Power Packs that have just been released.

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MADNESS Autoworks has been featured on:

Who We Are

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

Our goal at 500 MADNESS is to provide you, our fellow enthusiast with the very best in products and services at reasonable prices with a personal touch. We treat our customers like family members and do our best to make sure every one of our customers gets the very best treatment possible.

Follow along as we customize Nigel Olsson's FIAT 500 ABARTH!

"They make my dreams come true."

- Nigel Olsson

Internationally Recognized Drummer with Elton John
FIAT 500 ABARTH Enthusiast / Race Car Driver

The Ultimate Test Drive

with Ted7

Exotic Car Photographer
Insanely Good Driver

Ted7 takes his ABARTH to MADNESS for upgrades
and sets off on the Ultimate Test Drive all across USA.
Follow along as we customize Antonio Sabato Jr's FIAT 500 ABARTH!

"A whole different beast."

- Antonio Sabato Jr.

Actor / Spokesman / Model / Race Car Driver
Huge FIAT Fan!

Optima Ultimate
Street Car Invitationals

Footage of our MADNESS ABARTH running with the Big Boys at the Optima Ultimate Street Car Invitational!

See what people have to say

...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

Hello sorry to bother you, I just got my package and I love everything. Thank you so much. This is for my boyfriend's 21st birthday coming up and this is the first time I bought him car parts. So thank you so much he recommended me a lot of photos from yalls website to choose from. Again thank you, and thank you for your time.


I love this site and your products are amazing. I am happy with all of these amazing things people can add to their FIATs! Grazie!

Rocco Cosentino

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! With the MM module work amazing. 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.
Shop Now

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.
Find Out More

Take your car to the next level!

From mild to wild, we can do it all!

Whether you are looking for a personal one of a kind car that will be the envy of your friends and fellow enthusiasts or want to create a custom car to help promote your company.

Community Driven

Community + Passion = Family

We treat our customers like family members and do our best to make sure every one of our customers gets the very best treatment possible.
View Latest Meetup

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!

MADNESS in Texas

We're excited to be expanding our operations to Texas!

Established in Southern California in 2008. Now open in Texas!
Texas Overview Video

Accessorizing your ride has never been easier than with 500 MADNESS!

500 MADNESS works with 100's of manufacturers and stocks 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.

Let 500 MADNESS Customize your favorite 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 vehicle apart from the croud.

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 500 MADNESS is to deliver on time, on budget and in a condition that exceeds your expectations!
Our goal at 500MADNESS is to provide you, our fellow enthusiast 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