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Grassroots Motorsports Magazine did a test on this a few years ago. They ran continuously wider tires on the same size wheels and recorded the results and driver impression. According to their testing wider is faster, PERIOD. Every time they went wider the car went faster. The downside is that the driver commented that it started feeling less responsive. I would say that 225/45 on the 7.5" wheels and 235/40 on the 8" wheels should be ok. I would definitely recommend that you get a set of non-staggered wheels in the long run though. Unless you're pushing big power there is no need for staggered tires.
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