What's the shelf life on a suit anyway? I would suspect after time (mine did, although I didn't take that good care of it) you would want to replace the thing anyway due to wear, failing seems, etc.
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A suit should easily last seven years with good care, no doubt. Good care means not working on the car in it, cleaning it every weekend, etc. Yours lasted four plus years with brutal treatment - so seven plus years should be no problem with care.

Regardless it basically seems unfair that guys were perfectly legal throughout 2007 and will now be deemed illegal. And illegal based not on logical data, but illegal based on SCCA/Vendor relationships that don't have the safety of the racers as top priority, or doesn't appear to if the SFI specs are more lax than the FIA specs.

Ron