if it runs good a y8 is rated at about 130 horsepower and my y8 got 40-43 mpg. I got 46 mpg going to the beach. but if you want the 50+ that the vx can get you would have to do a swap. if you can post a pic of the entire engine bay we could recommend if its worth the swap (if you would have to search around for a bunch of vx parts to change it back over)
even if it still has the original vx harness then you would still have to do some wiring anyway because the p28 uses a 4 wire oxygen sensor and they wouldve had to change that over for the y8 to run properly. (the vx uses the 5 wire oxygen sensor)
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