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ThunderMax® Marelli EFI Conversion Kit for 1999-2001 Twin Cams® Double click on above image to view full picture

ThunderMax® Marelli EFI Conversion Kit for 1999-2001 Twin Cams®

As low as: $2,095.00

Price as configured: $0.00

Overview

Stop cussing that early EFI system, just replace it!

Zipper’s has taken the popular ThunderMax®EFI electronics and merged it with a Delphi®-style single-throat throttle body (with the help of some specially made parts) and developed this conversion kit for bikes with the earlier systems. This kit allows you to retain the original wiring harness and gas tank, while upgrading to the same components used in Zipper’s popular high performance Muscle series EFI engine kits for Delphi®-equipped bikes.

In compliance with ARB emissions laws, this product is not sold or shipped to California.

Price as configured: $0.00

Details

Tired of Performance Issues with Your Marelli-based EFI Harley®

 

It’s Time to Upgrade Your EFI System!

 

It’s no secret that the earlier Magnetti-Marelli EFI used on 1995-1998 Evolution® and 1999-2001 Twin Cam® baggers has ‘issues’—hard starting, erratic idle, harder yet to tune.. If these are issues with your MM bike, this kit will solve them!

 

Zipper’s has taken the popular ThunderMax®EFI electronics and merged it with a Delphi®-style single-throat throttle body (with the help of some specially made parts) and developed this conversion kit for bikes with the earlier systems. This kit allows you to retain the original wiring harness and gas tank, while upgrading to the same components used in Zipper’s popular high performance Muscle series EFI engine kits for Delphi®-equipped bikes.

 

Instant starting! Consistent idle! Superb performance! It’s all here in this kit, and the expansive library of ThunderMax® high-resolution base maps will have you up and running in no time.  The ThunderMax with its integrated AutoTune transforms this system to full closed-loop automatic air/fuel ratio correction, maintaining your custom tune no matter what the ambient conditions or elevation you choose to ride in!

 

Includes detailed installation instructions and TMax Tuner software.  See part number descriptions below for available throttle body sizes. For additional information regarding exhaust system compatibility, see below.  You’ll fall in love with your bike all over again! 

 

SPECIAL EXHAUST NOTE FOR MARELLI-EQUIPPED MODELS - ThunderMax® includes wide-band, 5-wire oxygen sensors that thread into 18mm x 1.5mm bungs located near the exhaust port, same thread size and location as stock narrow-band, 2-wire sensors used on 2007 Touring model exhausts (previous year bikes were not equipped with oxygen sensors). If the exhaust system on your motorcycle is not equipped with oxygen sensor bungs in the 2007 location (near the cylinder head exhaust port), 18 x 1.5mm bungs will need to be added to the existing headers, or purchase an exhaust header with bungs installed.

 

 

This product is not for sale or use on pollution controlled vehicles.

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Customer Reviews

6 Item(s)

Didn't want to stop riding she was running so good!!!! Review by Chapman
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You folks did a super job my 2000 Ultra is truly running much, much better with a lot more power everywhere. Finally had a chance to put some miles on her yesterday and today about 350 miles total. 150 miles yesterday across the mountain got up to the 5500 ft. level and back down to 2500 foot level no problem with the new Delphi system other than a couple of pops but they cleared and only had one today even got 40 miles to the gallon in the process. Today was on the expressway so I could open it up a little more and mileage went up to 42.6 so I guess that means it's self-learning cause I didn't hold the throttle back got up to 80 a few times today and made some strong passing pulls truly fantastic night and day difference . So very glad I made the change I have a new bike for sure capable of running with the latest Bikes out there. I'm excited and really didn't want to stop riding she was running so good!!!! (Posted on 10/13/2015)
She runs! Review by J.C.
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I've lived 51 years and never saw the need to write feedback. However, the Zipper’s Performance conversion eliminating my headache Magneti- Marelli EFI system and adding ThunderMax® with AutoTune on a relatively stock 88 with 510 cam breathes fire! Wow! This baby runs! Incredible... Did I say my bike runs? Wow! God almighty, she runs. Wow factor deluxe and I can't stop smiling. It was the only real solution and you guys made it happen. (Posted on 10/13/2015)
Since the install my bike has not missed a beat! Review by B.S.
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I had the complete ThunderMax® Marelli Replacement System installed on my 1999 FLHTCU®. My bike runs like new! No more stalling, starts all the time, and idles well. With the old system, my bike did none of these functions very well. I've ridden 2500 km since install and my bike has not missed a beat. Well done ThunderMax®! (Posted on 10/13/2015)
NO BRAINER!!!!! Review by DUKESHD
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JOSH K, FROM DUKES HARLEY DAVIDSON IN CHATHAM KENT ONTARIO.... WE HAVE INSTALLED TWO OF THESE SYSTEMS ON BIKES, BOTH WITH EXTENSIVE ENGINE WORK WHICH MAKES TUNING THEM WITH THE STOCK SYSTEM A NIGHTMARE.. THIS SYSTEM IS VERY EASY TO INSTALL, BASIC HAND TOOLS WILL DO THE JOB, STARTS LIKE A NEW BIKE...EVERYTIME!!!!! THROTTLE RESPONSE IS NIGHT AND DAY DIFFERENCE, IDLES PERFECTLY AND BOTH BIKES SAW INCREASES OF ABOUT 6 H.P, IF YOUR HAVING TROUBLE WITH YOUR MAGNETTI MARELLI SYSTEM THIS IS WITHOUT A DOUBT THE WAY TO GO, GREAT KIT!!! THANKS TO THE ZIPPERS TEAM! (Posted on 6/8/2015)
Tremendous Review by AcrashJ
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2000 Roadking with 247K miles and runs like bat out of hell. I put this conversion on about 5 years ago with 50 MM injection nozzles and it is the perfect bike. More power than the new bikes and better mileage. I spent one trip from SLC to Reno tuning on computer and can't sell the bike now because I can't find one as good. (Posted on 6/8/2015)
Best money I HAVE EVER SPENT ON MY BIKE...... Review by bill
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I got this kit and it was the best money I have ever spent. It's like having a new bike. And they were very good to work with. They told me that it dose not add power but they are full of shit this bike just wants to go . My bike is a 99 road king and it feels like a new one.... (Posted on 6/8/2015)

6 Item(s)

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Additional Information

Brand ThunderMax®
Fuel / Air EFI
Model No
Engine Type Twin Cam®
Emissions Compliant No
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