Does anyone know if adding the headers to the F prevent the car from passing emissions? I live in Atlanta.

 

Where will you be installing the cats? On the stock exhaust to have the 4 cats on the exhaust?

 

I was under the impression if you added the headers it eliminated the 1st cats

 

The headers eliminate the primary cats, you'll be left with the secondary cats.

Not sure about the emissions, I come from CA where it won't pass. I believe the Eastern states are more forgiving in that department.

 

I live in NC as well as inspect cars for the state of NC. What county are you moving to?

 

Wake county. Will emissions be an issue?

 

That's correct, but you can weld a pair of high flow cats to the stock/aftermarket midpipe.

 

Any tips on the install? Things to watch out for? torque specs?

 

Reviving this thread...

I also have the PPE headers and they are awesome and in combination with the Borla Exhaust, the sound and power are great.

HOWEVER, I can't tolerate the SMELL... I love driving with the windows down and can't do that at all. All the smell comes into the cabin, especially at a stop sign.

Even my kids were pointing this out. "Dad, your car is awesome... sounds awesome... but smells awful!!"

If I was to go with Hi-Flow cats, where do you place them (provided you use an aftermarket exhaust like the Borla I am using)? What hi-flow cats are recommended? Any specific specs? I don't think the secondary cats are connected to the O2 sensors, are they?

Thanks in advance,
P

 

I've ordered the PPE headers & exhaust, as it's the only one I saw available with the option of having hi flow cats already installed. PPE puts the cats in just a few inches behind the header flange. The idea is to get heat into the cats as soon as possible, which is why the OEMs have the cats in the header itself, for lower emissions during warm up. The PPE exhaust has also has bungs for installation of O2 sensors, so there's no check engine light. I like to go fast, but also like clean air, and retaining my vehicle's resale value.

 

Is the PPE exhaust necessary in this set-up? Or can you do JUST PPE headers + hi flow cats into stock exhaust? Just wondering because I'm far more interested in performance (biggest gain from headers, right?) than making more noise. And, in fact, am scared if it makes a lot of noise I'll hate the car on 5 hour drives. Audiophile music appreciation is my #1, can't raise that noise floor!

 

^^^^Completely stock, the ISF has four catalytic converters (two sets). Two are in the stock exhaust manifolds and two are in the stock exhaust. The two in the manifolds are measured before and after by sensors. If these are removed from the system (installing headers) an o2 conditioner or simulator will need to be installed. If you retain the stock exhaust system you also retain the secondary cats, so the need for Hi-Flows goes away, unless you want to remove and replace them.

Lou

 

Have you seen the stock exhaust? After the secondary cats, it narrows into a single resonator, which then dumps into a "crushed" for clearence "Y" pipe going to the 2 rear mufflers. If you want to go to the trouble and expense of headers, ditch the stock exhaust, and add more and/or quieter mufflers if it's still too loud (IMHO).

 

Most if not all after market exhaust have bungs to reinstall the sensors. This of course doesn't prevent a CEL if you have headers. The CEL is prevented by the O2 conditioner.

 

The aftermarket cats and 02 sensors WILL prevent the cel.