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These are not engine dynos. It should not come as a surprise that the numbers came out all over the place.

All on 91 octane. Hopefully this is not a repost. https://www.carscoops.com/2026/04/mustang-dark-horse-dyno-test/#Echobox=1785737149

How difficult is this to change?

I am reading your post and asking why? You are not likely to pick up anything by removing them from an otherwise stock car and no headers. You are also in California, and that means you have to be more careful than most other locations in what you do if you wish to keep driving on public...

Jealous of your garage and lift . . .

Is it feasible to change whatever Ford did to meet the stricter environmental regulations?

What did you do about the check engine light for cats? Take a look at the SmoothBoost Controller. It has the ability to leave the current pulley size but bleed off boost, which reduces your power and reduces the IAT due to less compression of the air, in addition to lower engine operating...

This forum member got 700 horsepower on 93 with the 120mm pulley. https://www.mustang7g.com/forums/threads/ess-g3x-with-120mm-pulley.177148/#post-3524578

Is 4 ohms the right resistance? Please report back on the result.

https://www.enginelabs.com/tech-stories/engine-tech-stories/elan-power-products-builds-a-10000-rpm-naturally-aspirated-coyote/?fbclid=IwY2xjawTcyOdleHRuA2FlbQIxMABicmlkETF3QXB5NlNncTZ3WEtrWEdQc3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHnQMS2O97BwPkz403sjl3GUNXlu8Mb1OP2YNTqTC2j53DraHxIBqWvNWemU4_aem_...

They go in front of my oil cooler air intake???

What is on there now? I see you live in California. That's a big state, with a lot of different driving conditions. What is winter like where you live?

Which headers?

In fairness, though, you are not talking about the cats I linked. Guys try to run stock or "Green" or "HO.' 🤣 GESI has lower horsepower options for the 800 horsepower crowd, but they also have converters engineered for 1,000 and 1,200. Unless you actually installed a pair and ran it and...

OH! An Australian SUV. I had no idea what this was. Looks like a neat truck.

LOL, I know, I know . . .

Or spend the money $$$ to get and install some real cats designed for your power level and heat. E.g., Gesi 85600 GEN2 Advanced G-Sport UHOX EPA Core Only, rated up to 1200 hp, but costs over $2000 for the pair, and it is still a 400 cell converter, so it should actually work as designed. They...

Heat is what kept me from doing that. After tracking the car, I decided I will want to do more of that, and it is really, really difficult to keep a forced induction car cool enough to go at it for 20-30 minutes at a time. Compare street driving and an occasional pull or quarter mile drag...

I haven't seen one.

So adding about 5 gallons of E85 at the pump. Has anybody compared a stock tune on 93 to running E30 already? Maybe the difference would be even less?