GCCBrian

Christmas is right around the corner, and i'm basically trying to catch on some Black Friday/Cyber Monday Deals on american muscle. I have a 2006 Mustang GT with a Flowmaster American Thunder Axleback system. I want a louder sound, so I decided to buy a Pypes Offroad X pipe for it. Would this do any harm to the engine without a tune? I plan on eventually buying an intake and a tuner down the road.

Other than the CEL - is it harmful to my engine?

JCON

Better shops that add an off-road set up recommend a tune to turn off the rear O2's and add a little fuel to keep it from running lean at times.

Nuke

Other than throwing a CEL for the rear O2's, you should be fine.

86HOGT

Random question. Can you turn the rear o2's off with a Bama tuner?

Carcrazycorey1

I have a Pypes O/R X-pipe on my 05 GT and have had it on there since July, just now got a tuner and it never threw a CEL. Maybe I'm lucky?

JCON

Bama should be able to turn it off

Nuke

What JCON said...

The O2's can only be turned off by someone with license rights to the PCM's programming via the tunes you buy. The O2's are not user-adjustable from the handheld.

86HOGT

That's what I was getting at. I have a Bama tuner from the PO, but I'm about 5 hours away from it ATM.

So I personally can't turn off the rear 02s without getting a tune from AM and downloading a new tune.

JCON

Not with an SCT tuner. I heard at one point that the Diablo Predators could from the user menu but SCT devices need a new tune.

AMDanBailer

Besides throwing a CEL for the cat's missing, you should be okay. I would recommend getting a tune ASAP so that we can turn off your rear O2's and adjust your tune a bit for the O/R X-pipe!

Hope this helps. Please let me know if you have any questions or need some assistance in the near future!

-Dan