The Buick Regal, the US version of the Opel / Vauxhall Insignia is set to recive a complete tuning package from US aftermarket parts dealer SLP, with the company using a special name for this.

We'll start with the designation, as SLP has chosen to bring back the GNX moniker from the 80s'. Under the hood, the 2.0-liter turbocharged engine will be boosted from the standard 270 hp to at least 305 hp, which is still less than the Insignia OPC's 321 hp .

In addition to that, the GS will be gif... [...]

Source: autoevolution