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Old 04-20-2015, 07:36 PM   #2 (permalink)
IAmTheStig
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Whilst technically a "Flat 6", the 2012 Porsche 911 GT3 RS 4.0 had 500hp and 339tq from a naturally aspirated 4.0l engine. Pretty impressive.

Does that count???

2012 Porsche 911 GT3 RS 4.0 First Drive – Review – Car and Driver

There are a whole slew of other NA 911s that also have/had more than 350hp.

The 2004 BMW M3 CSL had a NA 3.2l inline 6 rated at 355hp.

http://en.m.wikipedia.org/wiki/BMW_M3

Last edited by IAmTheStig; 04-20-2015 at 08:06 PM.
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