I've got MBRP race cat-back and MMR air intake and the car goes like crap...!!
 

Hi, I might need help here, certainly advice and inputs.

I've just fixed the MBRP race catback and at the same time I've put the MMR air intake and the car sound well but goes crap, it can't take the rpms like it should.

Both parts claim there is no need for a tune but I believe they do.

What's going on? Any of you guys have had this kind of performance nightmare?

Thanks.

what do your A/F ratios looks like? I guess you can use your info gauge but I don't know how accurate it really is.

I didn't check, just fixed both parts without touching anything else.

well drive it around keeping an eye on your A/F. its should stay around 14. if its consistently out of that range then it will need a tune. if its running lean I would stop driving it until you get at least a can tune or find dyno time. or put everything back to stock

How can check the A/F? Do I have a gauge where to read the figure?

Sorry for my ignorance, I'm new to Mustangs...

well on my car (I don't know if cars across the ocean are the same) I use the navigations buttons on the left of the steering wheel to navigate to the "gauges" option. click that and it should bring up a bunch of sensors. the first one is your A/F ratio