does the 05 have less horsepower ?
which modelhas the 390hp and 399 tourque and which has the 400hp 408 tourque

 

They're both 400HP (as are all years). Or, both 390. The meaning of HP varies.

Mods can add HP and there are many threads with details.

 

Didn't the SAE revise their HP figures in 2005? Also, variable timing came in around 06 I think

 

I believe SAE did (details on the net). The VT was needed for emissions (as was SAI). I bet the cars varied by (say) 10HP as they came off the production line, too.

 

Some say the 05's+ actually redline first through third, some say they don't. I would say its really up to your tires and driver skill over the year of the car. I think our forum members who frequent the track who have 03's do just as well as the later year models. Once you start modding, it really doesn't matter...

 

http://en.wikipedia.org/wiki/Horsepower


On the street the 2005 and up cars seem to run up to red line better than the 2003-2004 STR's. We don't see as many postings as we use to but many complaints from the 2003 STR owners of short shifting before redline especially in 1st and 2nd gears. One of the early road test's on the STR it only ran a 14.1 sec quarter mile because it shifted at 5900 rpm instead of the 6100 rpm redline!!



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2005 and up are a little faster from personal experience, but then again the driver plays a big role,
I found this vid its an 05 STR vs. 03 STR Watch it,

 

Looks like the 05 out launches the 03 and then they are even from there.

 

they are the same, any individual differences would be down to driving conditions and how well each exact vehicle has been maintained.