03-08-2007, 10:48 AM
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CC Member
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Join Date: Aug 2006
Location: San Diego,
CA
Cobra Make, Engine: SPF1715, Roush Built 434 ci Stroker, Dart Block, Ported AFR 205 Heads... 561 hp / 547 tq, Former Roush Show Car, Completed and Prepped By Olthoff Racing.
Posts: 1,066
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Not Ranked
I have 2500 miles on my SPF and I am running 17's and have no vibration at all at any speed. I have had the car in the 130 mph range and it was very smooth all the way up and back down.
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