The Cadillac CTS-V is probably the most direct competitor to the SRT8. In 2005, Motor Trend put one against a 300C SRT8 and it beat it by a nose. There are several key areas to consider:
Cost: the Caddy is between $6-12,000 more than the SRT8s
Yearly Changes: the CTS-V has had a significant change each year. The 2004 model year suffered from severe axle tramp on hard acceleration. That caused it to be stuck in the mid 13s in the 1/4 mile. For 2005, GM redesigned the suspension and eliminated most of that problem. That dropped ETs down to 13.1. (There is a TSB to retrofit the 2004s.) For 2006, Caddy switched motors in the CTS-V. The original came out with the C5 Z06 motor
5.7 liters
400hp@6000
395lb-ft@4800
For the new C6 base motor that they added to the GTO in 2005
6.0 liters
400@5200
395@4000
I haven't seen this new motor tested but since it makes its power at lower RPMs I would be tempted to think it might lose some top end in return for a better bottom end. That motor in the GTO ran a 13.3 versus the 300C SRT8 at 13.2. It was actually quicker than the SRT8 to 40 but slower over 90mph.
I guess GM wanted to save on production and just make one engine for multiple models. Also, the new engine's power numbers look more automatic friendly in case Caddy wants to offer its new 6 speed automatic.
Size: The CTS-V is about half a foot shorter and narrower. It has less back seat and trunk room but weighs 300 lbs less than the 300C SRT8.
Trans: For now, it only comes with a 6 speed manual.
Other: Don't forget the new Seville (STS-V) now has even more power than the SRT8.
The official power ratings for the 2006 STS-V -- 469 hp at 6,400 rpm and 439 lbs.-ft. of torque at 3900 rpm - are certified by the Society of Automotive Engineers (SAE.) SAE's new voluntary power and torque certification procedure (J2723) ensures fair, accurate ratings by allowing manufacturers to certify their engines through third-party witness testing. GM was the first auto manufacturer to begin using this procedure to certify power for its new engines.
http://www.theautochannel.com/news/2...28/138628.html


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