13psi outer spring for the GFB EX50 external wastegate (the spring supplied as standard). Combine with the 7psi and 9psi springs for boost pressures of 7, 9, 13, 16, 20, 22 and 29psi.

Genuine GFB (Go Fast Bits) part, supplied by Boosted Performance Parts, Sydney. Not sure it suits your car? Contact us with your make, model and mods before ordering.