The Ohio-based tuner, Switzer Performance Innovations (SPI) proves that they have more than one tuning trick up their sleeves introduced a milder performance upgrade for the Tiptronic-equipped 911s besides their previous 1,000hp bolt-on package for the Porsche 911 Turbo.
The new tuning package, called L4 700/750, is flexible enough for daily driving and was really intended to attract a wider customer base. On top of a regular 997 Porsche 911 Turbo SPI added its own bespoke DME software, two upgraded variable-turbine-geometry V3 turbochargers, fresh intercoolers and race-style full exhaust system.
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