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Old 01-29-2026, 12:43 PM   #7
Sliver
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Quote:
Originally Posted by TorqueDog View Post
I had my E550c (M278 engine) tuned to 550HP/705FT-LBS (Stage 2, stage 1 was ~503HP) and it was glorious. Reliability was unchanged, which is to say it was trouble-free; I did the regular maintenance and it was just fine.

If you're gonna do a tune on the E400, do a Stage 2 and try to get downpipes done at the same time. It'll dramatically improve the responsiveness and the end result.
Yeah, sold now, but my CLS550 had this tune as well and was a rocket and totally reliable for a decade.

I actually tuned my F-150 3.5 Ecoboost last week. The tune just came out for the 2024s through Ford Performance (I've been checking weekly for this tune for over a year). It's not as aggressive as a non-Ford tune, but it maintains my factory warranty. Adds about 115 ft-lbs of torque and 55 horsepower or something. $1300 all in and installed at the dealership. Again, not the greatest deal and these motors can make way more power, but I want my warranty.

Results are great. I have 33" tires so it'll never be a sports car, but I've gotta be in the low 5 seconds for a 0-60 and it is fast and monstrously torquey. It's faster than most sports cars from the 90s and it's a big truck. I think I'm over 600 ft-lbs now.
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