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1: Stock - The stock system uses three mufflers... A collector behind the cats, a resonator that sits sideways behind the gas tank, and a small muffler near the cutout with two tips sticking out of it. The exhaust goes from the 2 cats into the front collector, and then a single 3" stainless pipe runs back to the center resonator. The center resonator has a single pipe that runs to the final muffler, at which point it's split into dual tips. On the '01 those tips are chrome. This system is very quiet, but it's also very restrictive in terms of air flow.
2. Hugo Design - The "Hugo" design replaces the front collector and center resonator with high flow mufflers (Magnaflow, Rhino, Dynomax) and removes the rear muffler all together. The exhaust flows from the cats into the new collector (most have used the Dynomax), and then uses the stock intermediate pipe back to the new center resonator (magnaflow/rhino). The difference is that now their are two pipes from the center resonator, one to the existing cutout and one to a new cutout on the right side. Finish off the pipe with the tips of your choice. This system has a very nice growl to it. There is a small amount of resonation in the 2,000 - 2,400 RPM range, but I actually like it. This system allows much better air flow and some improved MPG. You can notice a performance difference immediately. The system is about $500 installed.
3. Borla - The Borla system essentially replaces the stock with high-flow components and leaves out the rear muffler. The exhaust exists the existing cutout (the benefit). The system isn't cheap, and it is reported to be louder than the Hugo system with more resonance in the 2,000-2,400 range. Borla has provided venturi tubes to fix this, but they have to be welded in.
4. Straight duals. - Instead of running the pipes from behind the cats into a collector, a couple of people here (Av, Phases) have run straight pipes from the cats back to one resonator muffler on each side, and then straight back to tips on both sides. This system is significantly louder than the others mentioned above, as there is only one muffler between the cats and the tips on each side.
Here is a link to my photo galleries, including my dual exhaust page, which has a diagram of the Hugo design that I used plus pictures of the install. Anyone else notice that Photopoint has been off line more than it's been on?
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