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It's a great high quality unit, but the lack of internal baffles (like the stock unit has) means that you'll get a low coolant warning as the sensor coolant-starves under high G or elevation changes, since the coolant just sloshes around from one side to another.
Found it as Spec B now.. Not sure what is missing from your Spec a setup..
But they seem to have it in stock. https://pettitracing.com/products/al...spec-b-kit-rx8 $349.00 its 100 bucks less if you just want to replace the Expansion tank only .
Are these overflow bottles still available? Haven't seen any updates on this thread for awaile & no response on email.
Did they ever respond to you ? I emailed them a couple weeks ago. I know this thread is old but recently rebuilt my front end and need a new coolant tank but don’t want the OEM one