Jeff drives all of his cars hard on road courses. He loves the handling and braking performance of his new CT4-V Blackwing, but like all of us, wanted more power. In stock form, his Blackwing put down 410 whp on the DynoJet. With Blue Belt mods and his Mississippi ethanol-free pump gas he made 479 whp. With the addition of our fuel cam and some custom dyno tuning he was able to hit 546 whp on E30 blend. Straightaways will be MUCH more fun for Jeff now!