Hurricane87 
The LS4 in my GXP generally performs much better than the one in my Monte Carlo SS, with one notable exception. Giving it premium fuel produces absolutely no performance difference over regular. Any ideas as to why?
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12-23-2019
The LS4 in my GXP generally performs much better than the one in my Monte Carlo SS, with one notable exception. Giving it premium fuel produces absolutely no performance difference over regular. Any ideas as to why?
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