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All US model MR2 Turbos had a MAF with a flapper. I am running over 370 HP or so and I still have the flapper in place.
The HKS VPC changes the system over to a speed density measurement system and completely eliminates the MAF.
If you are looking for LSD there are some aftermarket companies that make them TRd, Quaife, etc... the LSD was an option on the MR2 from 93 and up. You will need different inner axle hubs to use the factory LSD on a 91/92.
Good luck.
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