dude they ARE the 4age-20v setups
thats what inside the "box"
i will get some correct lenght velo stacks soon
FYI too short/too long velo stacks change the power band of the engine big time , justlike that of a ported sub box, same effect
they are 90mm velo stacks but are curved
i really need 110mm velo stacks to get the most out of the BP due to its design, but yes some straight stacks would be nice, providing 90mm straights fit and not hit the firewall