Precision Turbo Gen 1 Buick Grand National 5858, PT5858, TA58

This version is the best version if you're just looking to replace a broken stock turbo and make some nice gains while not breaking the bank , keeping good spool and not requiring supporting mods.

This turbo can be set to run stock power levels or turned up to comfortably make 60whp over the stock turbo.  High 11 second quarter miles runs have been made with this turbo.

You can use your stock actuator but the oem mounting bracket needs to be modified.  Or add the aftermarket actuator ready to run which features an adjustable rod to adjust boost.

Comes with the Buick Turbine inlet and outlet pattern making this installation pretty basic (no welding).

This comes with the Surge Ported 'S' compressor cover to flow more and preventing any compressor surge that may occur.  This turbo inlet is 4" requiring a different intake to bolt to it.   The Compressor outlet is 2.5" requiring a 2.5" to 2" silicone adapter if you are running stock intercooler piping.

Turbine A/R ratio choice of .63 or .82 a/r.

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This turbo is rated to support up to 620hp.