I actually finally fixed my hot start problems on my 04 RX8. I installed Mazda coils instead of aftermarket ones that were installed less then 3 months ago. That helped somewhat. Then I tried 400mls of Restore Engine Restorer. I cannot believe it worked. After about 50 miles I noticed it starting to get easier to start when it was hot. And the more miles I put on the better it got. I have put 250 miles on it since and it starts every single time when it's hot now