There have been so many threads debating the same question. It appears to me that the overall educated consensus (being those people who actually know about performance mods) is that a chip, pre-muffler, and muffler will give you everything SSI's will and possibly more. This only goes for the 3.2. The 3.0 will definitely be better off with the SSI's. I am in no way an expert, so I am just giving you a summary of lots and lots of opinions, weeding out the individuals that I believe are more experienced than others. There are still some individuals out there that seem very experienced with opinions that may vary.
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