B-SERIES - 4TH GEAR INPUT boosted Back cut to reduce valve

Back cut to reduce valve weight for higher rpm

This combination provides huge exhaust flow energy without restriction It shares identical fitments to the GT42R and S372R setups (bolt-on for a twinscroll T4 manifold and 4" downpipe)

Denso lower

Lower spring frequency for more precise valve control

the APX 400 offers unmatched power and speed for general XFWD class hi-performance cars and limited tractor classes

B-SERIES - 4TH GEAR INPUT boosted Back cut to reduce valveB SERIES 4TH GEAR INPUT HO B4GDB6D 1273 PPG REPLACEMENT GEARS Unleash Unmatched Durability. Pfitzner Gear. PPG sets the standard for strength & longevity. Scientific design & cutting edge manufacturing create gearsets built to outperform & outlast the competition. Experience unparalleled performance, race after race. Invest in Pfitzner. Invest in Victory.