Im running 2 smallport 4agtes,
one built motor running a t28bb off an s15,
one stock engine with trd metal headgasket running a t28 nonbb.

both running microtech and jdm rwd manis

t28bb 170rwkw @ 15psi
t28 nonbb 129rwkw @ 11.5 psi

both are extreemly responsive making power from 2.5 grand up but both have no top end.

make good torque aswell.

any views on getting top end and running lower boost?