Hi LuisR,
I couldn't fix it, but I did a search on
Renntech and came up with the same link c/o dj.
http://www.renntech.org/forums/index.php?showtopic=10923&hl=bypass%20exhaust&st=40
(Note: click on the above link and then click on the link in dj's message)
The gentleman that szentej speaks of is in the link. He would be the person that you may want to contact.
Anyway, I hope this link works. You may have to register onto their website before you can view the thread though.