following up on the topic of COP coils used on the GXP; when the first coil failed onmy GXP several weeks back I replaced all 8 at the same time since the CADDY forums were reporting many failures of these coils and I did not want to replace 1 at a time over the next weeks and months. The replacements I got were labeled under Wells and the coils were all marked with ACDelco. I also purchase an additional "spare" coil from AIP on ebay. The coils from AIP were $25/each and appear to be no label "made in china" and marked as C564-28. The ACDelco coils worked fine over the weeks they were installed, so to compare the one "cheep" coil from AIP I pull out one of the ACDelco replacing with my "spare". Note that the coil from AIP FAILED within the first 9 days of operation (700 miles). My message from experience here is Beware of the no label imitations from China!
Put the ACDelco back in and all is fine again.