Headers on stock ZHP

Anyone installed just the headers on a stock zhp ?
I am interested in changes, what were the obvious changes you've seen ?

Low/High RPMs ? Sound ? Acceleration ? Torque ?
Has anyone dynoed before and after headers ?

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I would LOVE to change headers but am, thus far, dissuaded due to emmissions and connection questions. I think Magnaflow offers some sort of alternate cat design for the E46, but I haven't had all my concerns addressed.

@Hornung418

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RPMs don't change but headers add torque everywhere. Sound won't be that much louder with the stock exhaust but all the aftermarket exhausts will be seriously louder.

If you want the most bang for your buck, skip everything else and just do headers and a gear change

All of the things. Headers are huge plus for responsiveness and sound. If you have the time, effort, and ability to do it the right way, it's worth it.

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Has anyone done headers with high flow cats? Losing the cats is the only thing holding me back from trying headers.

And what is the right way? Is there a solution that provides satisfactory emissions performance without coding out faults and having to re-engineer all the wiring connections?

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Originally Posted by Reasoned1

And what is the right way? Is there a solution that provides satisfactory emissions performance without coding out faults and having to re-engineer all the wiring connections?

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Right way as in get it coded for emissions and using new gaskets, studs, and nuts. You're bound to have leaks if you don't. Pay for the quality ones or you will have fitment issues like me and have to pay a shop to chop and reweld the flanges.

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Does "getting coded for emissions" mean cover up the fact emissions are not working--kind of like how VW engineers do it?

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Originally Posted by Reasoned1

Does "getting coded for emissions" mean cover up the fact emissions are not working--kind of like how VW engineers do it?

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Hahahaha!

You can have someone tune/code the car so it disables the post catalytic monitoring and shows the readiness signal as N/A, thus avoiding any check engine lights and emissions failures.

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I had the secondary O2 sensors and SAP completely coded out like they were never there...

schmiedmann makes some nice headers, with optional 'section 1' (M3-speak) piping with high flow cats. looks like a decent option, but i'm not sure the cats will get hot enough to do anything.

I have the ebay headers with DEI Titanium wrap on my ZHP. They make a nice difference across the power band and sound great on the car with the stock ZHP cat-back. The CEL is the only downside...

https://www.youtube.com/watch?v=w_y-...ature=youtu.be

^^ that's stock muffler?? I'm doing this soon and...damn maybe I won't also do a muffler.

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Originally Posted by Hornung418

Hahahaha!

You can have someone tune/code the car so it disables the post catalytic monitoring and shows the readiness signal as N/A, thus avoiding any check engine lights and emissions failures.

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This is the way to do it. Code out the CEL and you're good to go until you have to pass emissions.

If you need to pass emissions like I do, Google area 74 o2 simulator. It's effectively saved the N55 crowd from the government nonsense. Works on any vehicle.

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Originally Posted by YoitsTmac

^^ that's stock muffler?? I'm doing this soon and...damn maybe I won't also do a muffler.

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Yep, and that's through a camera phone! You can see the stock ZHP exhaust tips in the video. The sounds are even better under load at full tilt... :drool

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Originally Posted by idrivemyself

Yep, and that's through a camera phone! You can see the stock ZHP exhaust tips in the video. The sounds are even better under load at full tilt... :drool

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I saw that but I honestly couldn't believe it. That sounds fricken fantastic! Congrats! I'm installing mine this weekend but am also going to put in a magna flow muffler. Now I'm worried it'll be too loud!

Thank you! I've long debated replacing the stock primary resonator with an x-pipe, but with the sound as-is...

Good luck with yours, post a video after it's done!

Header install delayed. Basically pulled every muscle in my body doing misc work on my car and a friends. Headers install next time I have energy! I'll make sure to post a clip.

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Originally Posted by Newjack

This is the way to do it. Code out the CEL and you're good to go until you have to pass emissions.

If you need to pass emissions like I do, Google area 74 o2 simulator. It's effectively saved the N55 crowd from the government nonsense. Works on any vehicle.

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necro thread....

might have a set of headers available, but I'm confused about the above. If I code out the post cat sensors (Kassel EU2 tune), would the simulators still be needed?

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Originally Posted by Bob1035

necro thread....

might have a set of headers available, but I'm confused about the above. If I code out the post cat sensors (Kassel EU2 tune), would the simulators still be needed?

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Kassel can code out the secondary O2's so you don't have a check engine light. You won't pass emissions though as they'll show "not ready."

If you need them to show readiness/cats are working, then you'll either need the area 74 simulators or an actual catalytic converter installed somewhere before the sensors.

Thanks for the info!