With TFS190 heads, track heat intake, Anderson power pipe, and front mount intercooler on a V3Si at 6000rpm I made 7lbs on a 6.87/3.33 combo, 9lbs on a 6.87/3.12 combo, and 10lbs on a 6.87/3.0 combo. Non-intercooled add 2lbs to each of those numbers.