i just installed the JDM 4-1 type-r header w/ 2.5 collector,
and it seem like i'm losing HP...
the pick-up is slower i think...
do you guys know why? what did i do wrong when i installed it?
i have a 97 type-r engine JDM B18C.
i also had 2 1/4 piping to the back...
i'm running a b16 ecu with a mugen chip...
anyways, the pick-up seem slower to me...
i don't know why.... what did i do wrong???