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These TI retainers are made to fit PSI 1511 & PSI 1515 commonly fit as performance upgrades for the 5.7 and 6.4 Gen3 Hemi. However, these are not your every day Titanium retainers. Don't be fooled by the big name companies or the ultra cheap versions out there. Titanium is widely used for valve spring retainers in racing for weight savings, but most just can't survive the cyclic loading from everyday or street use. This is why our product is superior. Made from Ti-6Al-4V, Grade 5 Titanium our product shines from the post processing that you can't see with the naked eye. Our post processing consists of shot peening and polishing to ISO Grade N4, then Mill Annealing with a proprietary process. We are able to offer such a high value product due to the fact that we process parts in batches between 3,000 to 5,000 at a time.