Cesar,

thanks for letting me have it then :)
About the gutted exhaust: I had a local shop open up the exhaust from the top, remove most of the baffling, shorten the resonance pipes inside the exhaust and weld it close again (all the details can be found somewhere inside this thread: http://www.babblers.org/forums/showthread.php?p=48230 ). As all the "damage" was done from the top there is no way anyone can detect the mod. Well, at least not by eye but definitely by ear :D

If anyone else gets a CEL after installing Fabspeed pipes or removing cats some other way, I found a fix. After reading a little bit, I tried installing spark plug de-foulers on the second set of O2's and it worked. You have to buy (4) 18mm inserts (can get them at any local auto parts store for a few bucks). Drill out 2 of them so the O2 sensor head will fit, then screw those into the second set so it brings the sensor out of the stream and limits the exhaust sample. Been driving it all week and the CEL has not come back on.

***Sorry to nab your post Chris, just figured this might help being that it's a relatd topic***

Actually it sounds much better across the whole RPM band.
I have a "DSE" (Dan's Sport Exhaust, see http://www.babblers.org/forums/showthread.php?p=48230 for details) and while this mod already sounded great, it really came to live with the bypass pipes :cheers: