If you have the mods to support more flow, you will certainly see some great gains from it. Of course, those can vary based on which muffler setup you go with. They offer 4 different ones I believe, a Flowmaster crossflow style muffler with 2 tips, a Flowmaster straight through style with a single hidden tip, a Spintech crossflow with 2 tips, or a Spintech straight through with a single hidden tip.
I have seen/heard of people get the 4" single tip system and substitute a DynoMax Ultraflow and pick up significant power over the same setup with the Flowmaster.
For a basic bolt-on car, their 3.5" system would be better though.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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