Originally Posted by Steve (Post 7219)

Are you guys seeing any issues with the 02's with the longtubes on these Coyote motors?

Originally Posted by Courtesy Flush (Post 7188)

The pypes headers are what i wish i went with, even with all their bad rep with fitment and quality. Seen quite a few guys running em and making good power. Stepped header design 1 5/8ths stepped to 1 7/8th into a 3 inch collector.

Best of both worlds? could be.

Wouldn't know as i went with the 1 7/8th SW setup personally, very exotic sound with these headers when you creep into the top of the rpm band.

Originally Posted by TrueStreetTim (Post 7233)

To a degree.....yes. If there is anything in common, maintenance wise, is I get calls about O2 codes. Typically with replaced headers, yes. But also those without. But keep in mind, no cats will kill them especially fast by comparison.

If you decide to change your sensors out, make sure they are OEM straight from Ford (not Bosh etc.) Tuning has shown us that the aftermarket sensors heat up and cool down just differently enough than OEM to possibly throw codes.

Originally Posted by Phuck Phace (Post 7236)

I have longtube.

Originally Posted by Steve (Post 7219)

Are you guys seeing any issues with the 02's with the longtubes on these Coyote motors?

Originally Posted by TrueStreetTim (Post 7233)

To a degree.....yes. If there is anything in common, maintenance wise, is I get calls about O2 codes. Typically with replaced headers, yes. But also those without. But keep in mind, no cats will kill them especially fast by comparison.

If you decide to change your sensors out, make sure they are OEM straight from Ford (not Bosh etc.) Tuning has shown us that the aftermarket sensors heat up and cool down just differently enough than OEM to possibly throw codes.

Originally Posted by Steve (Post 7235)

Knowing it would leave some HP on the table, but do the stock cats overheat if the stock midpipe is left in place?

Originally Posted by Courtesy Flush (Post 7254)

Funny you ask, http://dfw50s.com/showthread.php?t=454

been a nightmare and $300 to get this mess fixed.



see link above,

OEM parts have their fair share of problems too, as ive never seen a car with 7k miles(my own)throw an 02 so early with simlpe bolt ons. Given the conditions of my situation i understand the cause, but upon purchase of another OEM replacement 02, it was faulty. :disgust:

From this experience ive began to think its not the absence of cats causing the problem, but the placement of the 02's with LT's being further downstream. My issue was post cat so regardless of if cats were installed, i doubt it would have changed the issue.

Some food for thought for those of you lowered with longtubes, How close is your front 02 bungs to the ground? Connector placement?

Now compare to stock placement and connections. May be a reason for that?

Also i wanted to mention, my 11 SG car had an O/R pipe and stock headers tune and bolted @ 800 miles, never had one issue with the front 02's in 20K miles.

Originally Posted by TrueStreetTim (Post 7259)

I actually talked with my Ford guy this morning to get an O2 shipped. I asked if anything "funny" had been going on with O2's that he knew of. He said no. But then, for the first time, his system asked if the build date was (i think April 2010) or beyond. He said this was new. Perhaps something is developing and we just don't know what....yet.

Originally Posted by TrueStreetTim (Post 7259)

Same or different brand?

Originally Posted by TrueStreetTim (Post 7255)

I like where your going with this.

Not so much the heat as it would also be the added pressure from a higher flowing header. Especially if the car is S/C'd....you'll blow it apart! And without a tune after your header swap, you'll 100% throw codes. The midpiping must be replaced, along with the cats (or none), with a header swap!

Originally Posted by Steve (Post 7272)

What about with the stock headers? Will the stock midpipe live a long happy life with a power adder? I'm asking, because I don't want this car to be obnoxiously loud. My little girl rides in this car often and I rather not she be deaf by the time she is five. lol

Originally Posted by Phuck Phace (Post 7276)

If you want it quiet just get the magnaflow street series mufflers, they are still quiet without cats.

Originally Posted by Steve (Post 7277)

Not a fan of Magnaflow at all. I had them on my Ferminator and hated the way the exhaust sounded.

Originally Posted by Steve (Post 7272)

What about with the stock headers? Will the stock midpipe live a long happy life with a power adder? I'm asking, because I don't want this car to be obnoxiously loud. My little girl rides in this car often and I rather not she be deaf by the time she is five. lol