Do i need to dyno tune with the addition of long tubes

[rafagtmustang]

I have a 2005 mustang gt coupe that i have installed long tubes + it's appropiate shorty x-pipe with cats along with magnaflows cat back. My question is that one of my cat's went bad & i was thinking of just deleting them completely, will i have to adjust me current tune (c&l high flow cai + 91 octane) to compansate for the deletion of the cats???? your help is appreciated & keep up the good work & awesome products !!!!!!!!!!

[christina]

With modifications, a custom tune is always recommended, but if you are running good and just wish to take the cats off, you will need to have the rear o2s turned off.

[rafagtmustang]

Thanks for your quick reply i wasn't expecting that quick of an answer...(loyal customer)...now how do i do that? I know theres a way with my predator but just haven't figured it out yet. Any help ?????????

[Phil]

Go into the modify parameters section. Select OBDII. Turn off bank 1 & 2 rear o2 sensors.

[rafagtmustang]

than's a million guys. My last concern is that i live in california & we dont have 93 octane fuel (unfortunately) like you lucky guys in other states. There are no current 91 octane downloads in my predator are there any downloads for california 91 octane ???

[dallasmustang]

You can load the 93 octane tune then pull a couple of degrees of timing through the user adjustable options. I would start by pulling 2-3 degrees in all available sections.