I want to take the plunge and change my bonez cat for a midpipe. I have the base map in my pfc . My PIM is at
92% after 6000 RPM. (Was running way to rich) .

Do I need to send my PFC to XS for a retuning??

Wich parameter you suggest to change?

Please help

Thanks all
Serge

95 FD with PFC, Bonez Cat, Apex GT cat back, Y pipe,
Apex power intake, M2 downpipe, Denso fuel pump.

 

every car is different.
you need to use a wideband O2 sensor so you can get real readings of what YOUR car is doing. Otherwise, you are not really tuning anything, you're just guessing.

 

That is a "flow" component, so it will change your mixture if you keep using the same fuel maps. Any change in flow requires new fuel maps.

But I suggest dyno (or street) tuning with a wide-band rather than sending the computer out for a generic map. All cars are different.

-Max