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I got the RB Revi for mine just because I wanted to buy the car a new toy, but there wasn't a big improvement. As above, the stock system is well designed. Not sure why this is a bad thing.
But, so far the best performance for the $ has been the Cobb AccessPort. It would have been the first thing I did if I had known. (Although it's probably best to be having it tuned with my intake and exhaust on.)
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2004 RX8 GT
1986 RX7 Track Car: 13B Bridge Port w/ Renesis Internals and Weber Carb
2003 MazdaSpeed Protege
1988 RX7 Convertible - new project
2004 Impreza and 2003 Legacy wagons for hauling groceries and The Dog
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