I installed and did not add the headers on my 2009 Cadillac CTS-V. After about 10-12 thousand km I felt a slight dead center idling and under load at low revs with hard acceleration. These worked great! Because the standard plug leads (which I used) are so short, they gave me almost 100% coverage from boot to coil pack. I've only driven about 2000 km with it, but absolutely no problems.
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