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Were the MS6 wheels 18x7.5? My MS6 wheels were 18x7 +55mm. Do you have a link to the wheels? These would not be an improvement, If you went with 17x8.5 - 17x9, those would be a good improvement.
I also had a chance to buy the mazdaspeed rx8 wheels but seller wanted $$$$ for that which I didnt think made sense... are those good for track or also too narrow?
Weigh the same but 1" larger in diameter so angular momentum will be higher (they will "feel" heavier).
19" rubber will be more expensive.
Good wheels overall but your goals will dictate whether they're a good choice for you.
For the same or lower price, you can get Enkei RPF1 in 17x9 which will be muuuuuuch lighter, have lower angular momentum, wider, and you'll be able to use cheaper rubber.
For even less than that you can get the TR Motorsport C4 in 17x9 (lighter than R3 wheels but heavier than the RPF1).
Weigh the same but 1" larger in diameter so angular momentum will be higher (they will "feel" heavier).
19" rubber will be more expensive.
Good wheels overall but your goals will dictate whether they're a good choice for you.
For the same or lower price, you can get Enkei RPF1 in 17x9 which will be muuuuuuch lighter, have lower angular momentum, wider, and you'll be able to use cheaper rubber.
For even less than that you can get the TR Motorsport C4 in 17x9 (lighter than R3 wheels but heavier than the RPF1).