Faster, lighter, stronger — Porsche is taking its 718 Cayman from the street to the track with the new GT4 Clubsport. Porsche has spent the last few years replacing the naturally-aspirated engines with turbocharged variants, but the Cayman GT4 packs a 425 horsepower unaided flat-six, exactly how Porsches should be. Intended for only for the track, the GT4 does away with almost every creature comfort minus seats, paring down the curb weight to 2900 pounds and allowing for a welded-in roll cage. Further weight savings come from doors and a rear wing made from flax and hemp fiber agricultural byproducts, a first for a competition car. Two versions of the GT4 are available, one with a fixed suspension and the other with adjustable shocks. The only transmission offered is the PDK paddle shift, but the return of the flat-six more than makes up for the lack of being able to heel-and-toe around your favorite track.