Get a rerouted Divorced Down Pipe (DDP) along with those upgrades and you'll notice a BIG difference. Numbers, however, depend on many variables. Lets say somewhere between 50 and 75 ish? More depending on how strong your engine is and if its manual or not.
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my car:
1987 brownish Toyota Supra Turbo, automatic 7MGTE engine with ~100k miles on it.
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