Just get a Crawford Plenum and you won't need the Z-tube. LOL!

Turn down your stereo! :-)

Not sure how you cannot tell a difference? I did the exact same mod, Z-Tube and K&N (originally) and noticed right away and it is not subtle either? Granted, if you don't rev it over 4K, the sound is not there, but in the higher RPM's, it is a lot louder and sounds killer to the stock G setup!

What's the best place to get the tube from?

Classifieds, or I think everythingg35.com sells it as well?

You can't hear the sound difference? I am pretty picky on these 'small mods,' but the K&N most definitely added a 'whistle' and the Z-Tube made the growl at WOT resonate more than before - DEFINITELY. I don't know about performance gain but the car sounds different under acceleration.

Shoot me a PM, I'll buy those from you. I'll put those on our new 05 sedan.

340 was a combination of city and highway. Calculated the mpg on that tank to 19.5 thats 1 whole mpg better than i was getting before. We'll see how it continues

Diego, not bad.

I wish the car had 5 more gallon capacity.