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Both are rated at 300hp/300tq and have similar performance. Stock vs Stock, the N55 has a slightly louder rumble. Especially on cold starts.
N54
- Twin Turbo setup
- Easier to get more power from pnp tunes
- HPFP Issue, check the numerous threads and sticky in General Discussion. Warranty for N54 engine HPFP has been extended to 10 years or 100,000 miles.
N55
- TwinScroll single Turbo
- Pnp tunes in testing, but not quite as much gains as N54 tune
- So far no confirmed reports of HPFP issue
- Supposedly reaches peak torque at ~200 less RPM than N54
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2019 M2C - Alpine White - 6MT
2023 Supra 6MT - Deposit and Wait
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