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That's the thing, whenever I have taken the headers off there is no carbon trail on the flange or head, I don't know how long that would take to build up, I probably only did like 200kms of driving between each times I've had them on and off.

Yeah definitely having second thoughts at this point too, will wait and see what this turns out to be before I pass final judgment. But yeah at this point I'm about ready to drop 2.5k on ARH headers but we'll see if I can get to the bottom of this noise.

I'd really love for that to be the case... As pulling these headers on and off it certainly getting old lol. The thing I keep coming back to is the noise, to me anyway, seems to be coming from the driver side only, very very faint tick coming from the passenger side when you have the hood up...

Maybe I need to get it running and try and get under it and use the hose trick to see what I can hear around the area too

I've recently Installed headers on my 2017 GT and ever since I've noticed this ticking noise, it seems most noticeable under load/low RPMs, i.e high gear going up a hill or something really exacerbates it. Unless I'm next to a wall I can't hear it with the windows down, I can only hear it...

No sorry mate haven't put my car on a dyno or done any strip runs since I've had it. Going off what the Americans have found all the 1 7/8th long tube headers seem to be within a couple of HP of one another, so I would expect similar numbers to what other people are getting from X force etc. It...

No unfortunately it doesn't bolt up to the factory exhaust. The ad is BS. It does come with cats though, just not the joining pipework. My local exhaust shop charged $200 to mate it up in mandrel bent stainless. Surprisingly wasn't crazy loud running with just headers and cats so you probably...

Thanks mate. Here's the link :https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F192490046112 So they had them "on sale" for $625 when I bought them + I used to standard eBay 5% off voucher and came to $595. They have a make an offer option though so could...

Hmm yeah I didn't think many people had official "Ford" tunes in Australia, but yeah you are probably right due to it being a Ford branded tune they probably couldn't just turn off the emissions sensors... unless they have some "track only" disclaimer on it or something? Might be something you...

No problem, happy to help. Yep I put the cats in. They come with gaskets and just bolt up to the headers. Only problem will be is if you don't have a tune there is no bung for the rear 02 sensors, once you are tuned these are disabled anyway so I just removed them. All Lund tunes disable rear...

So I've been tossing up the idea of putting headers on the mustang for a while now and I had noticed after browsing through the main part of the forum the American's have had some success with the "cheap" eBay headers, Maximizer is one of the brands I think. Anyway, I thought I'd have another...

Emissions and noise I don't see would be a problem, they managed to the 18+ models complied over here with "track mode" being available. Gt350 is 50 state legal I believe so California would have higher emissions requirements than Australia I would imagine. What's wrong with the rear wheels? I...

To confirm for anyone who may find this in the future, My 2017 GT needed M10X 1.25 X 25 bolts.

Mate I'll be able to tell you what I find by this weekend, I plan on putting them in on Saturday. After many hours of trawling the web I feel pretty confident they will be M10 1.25 X 25 but I will post up what I find on my 17 model this weekend.

Like what? It's basically the same vehicle with suspension and engine upgrades. Places over here are managing to get supercharged 700HP+ GTs ADR complied I can't see why there would be an issue with a 5.2L GT350.

I've picked up a set of headers that did not come with any header bolts,I thought it would be a 2 minute Google search to find out what size bolts I need for 2017 Coyote Mustang header... I was mistaken. I've been digging through old threads trying to get to the bottom of if they should be M10...

Hey Ben, I don't know if you guys ship parts internationally or not but I thought it's worth an ask on here. I'm from Australia and I'm after a GT350 steering wheel (PN: FR3Z-3600-AC), it seems the cheapest way to get it is going to be through a US ford dealer and having it shipped over. Just...

It's good to see we are helping your deadlocked decision with this poll

Can anyone point me in the direction of a dyno of the 15-17 model with just the E85 tune for comparison? The 18+ is gaining 32hp and 30tq with just an E85 tune, what did the pre 18 S550s gain?