First off a BIG THANK YOU to everyone here in the B6/B7 S4 forum who has called me or emailed me lately with inquiries and praise for our hardwork. For those who's calls we missed, emails or PMs we have been slow to get to we deeply apologize and have some more help coming on soon to keep up. If you do call PLEASE leave a message, we WILL return your call.
Also a special Thanks to the B7 RS4 owners who have called from all over the world asking about our possible future offerings for you guys. We will get to you guys with some cool hardware soon enough. If there are any B7 RS4 owners in the SF bay area or Sacramento Area feel free to contact us to help us with R&D for new B7 RS4 parts.
NOW TO THE NEW PRODUCT.
For Manual Transmissions Only (Please specify in the comments during checkout, the year, model and how many speed transmission your Audi has when purchasing.)

Intro price of $350!
As of 3-27-09 we have the following coverage and cores ready to ship.
- B6 S4 and 05.5 B7 S4 - FVD, HEP, HSM trans codes only (We have Cores in stock!) The 06 and up B7 S4 and the B7 RS4 have a different part number for the center diff and are reportedly already 4:1, we are investigating this further.
ABOUT THE PRODUCT
The factory torsen center differential in the S4 and A4 provides a 2:1 torque distribution between front and rear. What does this mean? This enables the end of the car that still has traction (most of the time the rear) to deliver double the torque to the tires with traction. JHM's experience has found that this closer to even distribution is best for drag racing. So this modification is not for you if you are into drag racing primarily. However for Auto Crossers, Road racers and others who prefer the twisties JHM recommends a bias ratio of 4:1. This is the same bias ratio that Audi has provided in the stock B5 RS4 driveline.
So if you are tired of going through corners while using a lot of throttle and still getting "understeer" then this product is for you and will help you get a little more "oversteer" and allow you to drive the car a little more like a RWD car but still have the superior control of AWD.
For Manual Transmissions Only (Please specify in the comments during checkout, the year, model and how many speed transmission your Audi has when purchasing.)
Core Exchange
There is a core charge of if we send out a JHM center differential to you (see drop box below for amount). When you exchange your center differential for a JHM unit, send your differential back to JHM and we will refund the core charge. $650 core charge, check the chart above to see if we have a core in stock for you.
You may also send your differential to us for modification and not incur a core charge. We can usually modify and ship out your differential within the same day. If you will be sending yours in, unselect the core option and specify in the comments that you will be shipping it in. Also put the invoice number on your box when shipping it in for modification.
Please specify in the comments during checkout, the year, model and how many speed transmission your Audi has when purchasing.
VISIT OUR ONLINE STORE HERE TO ORDER -> http://www.jhmotorsports.com/shop/ca...products_id=46
UPDATE: I had many people asking for instructions. So I used a trans core I had here and some existing pictures and put together a decent instructions for you guys. These should get you through it with not too much headache.
Bookmarks