Empi and GKN is the way to go. We have been running the endurance car (original 158k miles car) since 2014. Four to five 14-24hr races per year. They started showing cracks in the bellows two races ago, but neglected them until tonight. We will be servicing them with GKN kits for the race in 2 weeks. Can report the findings, but based on experience, they will last a few years to come.
More importantly than the boot type/composition, be sure to completely remove all of the old grease when re-booting axles. Some grease compositions don't jive with each other and can actually cause friction surfaces - and of course, make sure the boots aren't rubbing on anything in the full swing of the axles. Many f the lesser brands have exceptionally large bellows that may rub the shock during trailing arm swing.
More importantly than the boot type/composition, be sure to completely remove all of the old grease when re-booting axles. Some grease compositions don't jive with each other and can actually cause friction surfaces - and of course, make sure the boots aren't rubbing on anything in the full swing of the axles. Many f the lesser brands have exceptionally large bellows that may rub the shock during trailing arm swing.
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