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I wouldn't dispute that the 4 bolt design is most likely stronger. As far as Aviators, they can also have the electric unit, so can produce a lot more torque and perhaps there's even an NVH aspect. And as far as PIU- everything on that unit is over engineered within reason and for a reason...

@ghostfranklin Thanks for doing the research, but there's just a couple of things I'd like to clarify from your post- The first statement seems to be attributed to me- I didn't make either of those assertions. Second, the number of Ford STs is supposedly 20% of sales, so if your numbers are...

Answering your original question depends entirely on the circumstances. I will say that if your local performance-oriented Ford dealer puts the aftermarket cats on- you're probably good. If you do it yourself or at an aftermarket shop, you'll be taking a chance. I'm not judging, but you do...

Any kind of "auto-tune" isn't coming from a tuner, it's coming from the stock ECU capabilities. Instead of a flex-fuel sensor, Ford uses its wideband O2 sensors (and may also use vapor pressure in the tank) to detect the changes in the A/F ratio, and this allows it to estimate and adjust to...

It's direct injection, so seafoam or any other fuel additive won't make any difference, other than keeping the injectors clean.

I'm assuming zrx61 you're in sport mode. It's supposed to hang onto gears when you let off for engine braking- but it can't read your mind. Put it in sport mode and trigger manual shift. Then you can make it behave more like your cycle.

I have the same story. When I first moved to Chicago some years ago I was an avid biker. After 1 year and several near collisions my mind went from "if" I'd ever have an accident to "when" it would happen. Since I had two small children at the time the bike became history. I got into rally...

Here's where I completely agree with you. Mod the car at your own risk. If you truly believe Ford did this on purpose so they could pay out thousands in warranty claims to save 30 bucks, I just can't agree with you. Maybe it was availability. Maybe it was owners with modified vehicles on...

Since this is at least the third thread on this subject, and it just gets more and more whiny, let me put in my two cents (yet again). I haven't heard of a single one of these "3 bolt" systems failing in non-modified cars. And that number is out of thousands that have been built, so even if...

Truth is, an otherwise stock ST with a ZFG tune on E50 and downpipes is capable of high 11s. That shows just how competent this platform is. To find another 100+ horsepower to get into the 10s; that's easy too- bring money!

My first thought like everyone else would be a slight crack in the cat. But this should be accompanied with some odd noise. Second would be a possible coolant issue, but since you insist it's not coolant, I'd suspect a wiring harness or loom is misrouted; potentially contacting a hot surface.

Looks like someone already grabbed the Whipple intercooler ;)

There is science, and then there's anecdotal research. I'm glad it works for you. Distilled water has even better heat transfer and will work better than any glycol mix if there's no need to extend freezing and boiling points.

Being honest, no sound recording is going to allow someone to diagnose this problem. There are literally scores of things that could be suspect. The two most difficult things to diagnose are noises and electrical gremlins. Dealerships, especially in warranty situations, aren't going to spend a...

There are a number of issues with both cracking welds on catalytic converters and flex pipes. First thing is when a dealership tells me it's "normal and coming from the wastegate", I'm going to roll my eyes. However, when you say accelerating, are you saying full throttle, or just any type of...

If you do a bit of research, you'll find that there's no way under the same circumstances that prop glycol is more efficient than than ethylene glycol. Propylene is definitely safer, but less efficient in terms of heat transfer (viscosity) and freezing point. That's why ethylene is used in...

What the heck is that first Rolls-Royce V12 for? At first I thought it was for aircraft duty, but on second glance what I thought was a gear reduction box looks more like a pump. And just curious, what plane uses those radials?

Your first message and this is what you post? You're kidding right?

One member here claimed their subframe was replaced by Ford with the 4 bolt model after the bolt sheared.

See my posts here: https://www.explorerst.org/threads/beware-driveshaft-kaboom-from-emergency-auto-brake.2148/post-36529