Should get more from getting both matched. Seems silly to me doing one and not the other.
KTEC will offer both im sure.
Jamsport - I got mine from Mark.
Jamsport were £140 i think for upper and lower on exchange basis
Has to be both sections to get the full benefit.
no more power just picks up better from low down, 3 feels MUCH better
hard to tell what bhp difference there is cos most people to it with a re-map but like most have said i would do both, that should help with with air flow and improved response, not all about bhp more about how it delivers it tbh.....
I gained 10bhp on the same rolling road from mine done by Jamsport..
Has to be both sections to get the full benefit.