I have EM longtubes, no cats (3" SS collectors instead), and recently added the new 3" Magnaflow SS system (#16837). It comes w/ an x-pipe that runs into a straight through resonator and out to the pipes back to the mufflers, which have dual 4" round tips (mirrored inside & out). The system never necks down (resonator included) and is a true 3" system all the way from the headers back. FWIW...I've heard pretty much every system imaginable on a C4 and this system absolutely kills.
This is the only system I've seen for a C4 that uses one continuous piece of pipe from the resonator back to the mufflers...instead of the standard two piece. The benefit being that you don't have clamps or weld lines that can be seen from the rear of the car. Very clean looking...see pic on jackstands.
Thx 4 lookin'....soundclips soon to follow.
Jeff
EDIT:
Oh yeah, I forgot the best part...
$581 shipped
from www.performancepeddler.com
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EDIT 9/9
As promised, here's a soundclip...not the best but you get the idea:
http://www.youtube.com/watch?v=7COogVWx5VQ
This is the only system I've seen for a C4 that uses one continuous piece of pipe from the resonator back to the mufflers...instead of the standard two piece. The benefit being that you don't have clamps or weld lines that can be seen from the rear of the car. Very clean looking...see pic on jackstands.
Thx 4 lookin'....soundclips soon to follow.
Jeff
EDIT:
Oh yeah, I forgot the best part...
$581 shipped
---------------------------------------------------------------------------------------------
EDIT 9/9
As promised, here's a soundclip...not the best but you get the idea:
http://www.youtube.com/watch?v=7COogVWx5VQ