ARP Custom AGE 625+ studs are the highest quality studs available and are recommended for any builds running 40 psi or more of boost! This super-alloy has superior fatigue cycle life, complete resistance to corrosion/oxidation, and immunity to hydrogen embrittlement. Tensile strength is 280,000 psi versus 145,000 psi from the stock 10.9 grade bolt. The CA 625+ also has a higher Modulus of Elasticity (30 ksi x 10³) than Inconel 718, proving its resistance to ...

Forgeline 17" McLaren beadlocks with MT Street R are 18.5 lbs lighter per wheel over our stock setup with R888R! This is 37 lbs savings of unsprung weight in just the rear alone! Assuming a 700 HP car and a starting curb weight of 3250 lbs, Porsche (assuming no caveat was provided) would be asserting that the effective gain from dropping 37 lbs of unsprung mass is ~90 HP!Not so fast!Maybe 2-3 lbs effective per lb of unsprung ...