i am a total honda noob.
i just got a 90 crx-dx i think it has a 1.5 in it.
totally stock so far.
i doing a header and hi flo cat (test pipe) and cold air intake.
and a ecu chip.
but what cat back system size should i get.
2.25" or 2.5"
i like the 2.5" but will i still have enough back pressure, and will it kill my lo
end torque ?
thanks for any help.