Removing GPF - high flow cats

[Ravax]

Hey dudes and dudettes!

Like the title.. Would it be easy to replace the factory cats on my 19' GT with high flow cats effectively removing the stupid GPF and letting my pony breathe more for a nice gain in power coupled with a tune? Or will my ECU go on the fritz and ill get check engine lights constantly?

Anyone done it yet?

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[Cordero1]

Im curious about this as well. I just recently found out tuners not playing ball anymore when it comes to going catless.

 

[Vlad Soare]

You can, but you will definitely need to tune your engine for it. And sadly, you will have to either do it yourself, or find someone who knows how to do it and who is willing to help you privately, because I really doubt you'll find a reputable tuning company that's willing to do that.
Take a look at HPtuners MPVI2+ and its associated software, VCM Suite. It's expensive, but very flexible, and allows you to tune your car yourself. There's also a forum where you can ask for help. Download the software as soon as possible, because the GPF-related parameters will be removed from the next version. And once that version is released, this one won't be available anymore.

Hardware
VCM Suite download
HPtuners forums

 

[Vlad Soare]

Alternatively, you can find a tuner that can increase the power without removing the GPFs, thus keeping the car legal. There seem to be several in Germany. Here's one that gives you 500 HP with a Bullitt throttle body, JLC intake and a custom tune:

https://auto-hentzschel.de/products...osselklappe-87mm?_pos=11&_sid=b5f2bafd8&_ss=r

 

[bankyf]

Is the GPF considered to be more restrictive than a catalytic converter?

 

[Vlad Soare]

I'm not sure if the GPF itself is more restrictive, or the tune that's required in order to account for the GPF is less efficient. Or perhaps both. Fact is, we get 10 HP less due to its existence.

 

[Ravax]

I'm not sure if the GPF itself is more restrictive, or the tune that's required in order to account for the GPF is less efficient. Or perhaps both. Fact is, we get 10 HP less due to its existence.

its the GPFs fault.. and also increases fuel consumption.. its basically a very restrictive sponge that sits in the cat, and collects particulate matter from burnt fuels.. just collecting it.. while you are in the low RPM range and driving around in the city.. and when you go on the highway and push the gas.. heat and pressure 'burns' it and expels it onto the highway.. basically poisoning fields and cows and the such.. it does absolutely NOTHING for the environment.. if anything its making things worse because it increases fuel consumption..

 

[Ravax]

Is the GPF considered to be more restrictive than a catalytic converter?

Yeah.. is a very tight-knit spongy thing that sits IN the catalytic converter.. its stupid as hell

 

[Vlad Soare]

Stupid or not, all I know is that my tailpipes are perfectly clean after 7500 miles. They really look like new. I've never seen this in any other car. I didn't think it was possible to have no soot at all on the tailpipes after so many miles. I've had three Ecoboost engines so far, one of which I still have, no GPF in any of them, and all of them had black tailpipes after one month of ownership.
So the GPF does actually work; there's no doubt about that.
Besides, your assumption is incorrect. The trapped particles are not expelled on the highway. They are burnt off in the filter. It's quite an ingenious system - smarter and more reliable than a DPF. It doesn't even require frequent trips on the highway, like a DPF does. It works fine in the city as well.

 

[Vlad Soare]

Anyway, if it bothers you so much, then you can get rid of it. But it's going to be costly, and not so straightforward if you have no tuning experience.
And in the end the power gain will be negligible. You'll get 10 HP at best, which you'll only notice on the race track at 7000 rpm.

 

[Rapid Red]

Anyway, if it bothers you so much, then you can get rid of it. But it's going to be costly, and not so straightforward if you have no tuning experience.
And in the end the power gain will be negligible. You'll get 10 HP at best, which you'll only notice on the race track at 7000 rpm.

My thoughts also..

 

[Ravax]

Anyway, if it bothers you so much, then you can get rid of it. But it's going to be costly, and not so straightforward if you have no tuning experience.
And in the end the power gain will be negligible. You'll get 10 HP at best, which you'll only notice on the race track at 7000 rpm.

I talked to a UK tuner yesterday and discussed this a bit.. with the GPF on yeah.. a tune would give me negligible HP gain but a good gain on torque down low.

With high flow cats.. and a tune with a good CAI.. they are saying a good 30-40 WHP gain..

 

[Vlad Soare]

Take a look at the link I posted above, from Auto Hentzschel. That's 50 HP while keeping the car legal, GPF and all.
It would require a trip to Germany, but that's not a bad thing after all. High distance travel is what Mustangs are for, aren't they?

 

[Ravax]

Take a look at the link I posted above, from Auto Hentzschel. That's 50 HP while keeping the car legal, GPF and all.
It would require a trip to Germany, but that's not a bad thing after all. High distance travel is what Mustangs are for, aren't they?

Yeah but 3k euro!! Not a bad gain I admit.. would make roughly 420 at the wheel..

That trip alone would cost me an extra 2 grand though.. so for another 2Gs on top of that might as well just get a Whipple

 

[Firsttexan]

Yeah.. is a very tight-knit spongy thing that sits IN the catalytic converter.. its stupid as hell

Now that I know what and where it is. What does GPF stand for, gas particulate filter?

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