86rx-7

Hi,
I want know what are the advantages of pulling out cats. Will there be a noticeable increase in hp ? Will it sounds to strong ? Any others informations will be interesting.

Thanks

Alex

jarrod

for one you will lose your working 5th and 6th ports
unless you hook them up to smog pump like later models

NixxoN

What are the effects of losing your 5th and 6th ports?

jarrod

on 86-(???) N/A models use back pressure
from cats to operate 5&6th ports...
around 4,ooo rpms there is enough back pressure
to open 2 more ports allowing more air flow
into engine.
but there are ways to make them function via
other means..like on later model N/A that use
smog pump pressure to operate ports


as far as effects go ...with non working ports
is you engine will not have the right amount of air
flow at higher rpms..

but if you wire them open you will loose bottom end...

now if you have ported engine thats another can of worms.....

86rx-7

thank you

Is this change hard to do ?

jarrod

just do a search on 5th and 6th ports there is a very
good diagram and pics on this...
sorry wish I could remember where it was