I do not think the 3:30 fuelstop Flash engines Stefan and I are mentioning are the same as we can buy in the shops. An avarage racer can still run 4:45 up to 5 minutes with a stock flash (I can with a JP modified 35+). The stock flash is a tiny bit higher timed than the 35plus21 so I think the avarage racer can be (for his level) fast enough and making 5 minutes.