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Originally Posted by Wret
There are already some holes just inside the inlets. I assume they were put there to "tune" the exhaust note. If you can enlarge those holes, as mentioned, you bypass some chambers and baffles and allow more sound through.
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My buddy and I have tried this. We cut a 1 inch x 2 inch hole just inside the muffler and after two hours work IT DID NOTHING TO IMPROVE SOUND OR MAKE THE MUFFLER LOUDER.
One actually has to tear apart the muffler and remove a lot of metal to get the sound to change, then weld it back.
The bypass system seems to be far more effective. We didn't try that and I haven't heard it on anyone's car as of yet, but everyone who does it says it sounds better.
Personally, I see no reason why you couldn't drill a one inch hole on both sides of the inlets where you would then weld the pipes to the center at a later point. An exhaust leak would sound different as it would be pre-cat near the headers. All the pipes do is route the hot gasses to the center of the car to be sent through the existing tip.
The only issue I see with drilling the holes and not putting bypass pipes in would be heat buildup. Lots of hot gasses building up under the bumper might melt something if you're stuck in traffic. It gets the trunk HOT HOT HOT now, and I'd hate to see what could be worse than what it is with unmodified OEM muffler.