You are talking about an H-pipe right? not just mufflers?
A good rule of thumb:
X\H-pipe will give you some gains...
A cat-back\mufflers will just change the sound.
You should only need mil eliminators if you're going with an "off-road" (catless) X\H-pipe.
If you're going off road, I highly recommend a set of mil eliminators...
__________________
Uncle Sam
"What the hell is up with all the gauges?
Calling Captain Kirk, your ride awaits... Phasers on stun...."
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