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      07-30-2010, 05:26 PM   #11
MarkR171
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Drives: SLK55 AMG
Join Date: Dec 2009
Location: Honolulu, HI

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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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2007 SLK55 AMG - Black on Gray/Black - AMG 030 Performance Package

2011 135i - Traded
///M-Sport - Dual Clutch - Harman Kardon - Bluetooth - iPod - Shadowline Kidney Grill - 225/255 Star Specs - Hotchkis Front Sway