New best today, only if I could’ve hooked my tires (track cold). Last day in Michigan all closed now.
Temp - 42* DA -140
All mods the same as before.
Your stock driveshaft is probably good where you are at now. The pinion flange is what, is out of balance. Thats why the stock driveshaft is a two piece. You will see two yellow dots, one on the pinion flange and the other on the trans flange (high spots). You can take the driveshaft pinion...
The Whipple gen5 with the upgraded heat exchanger (double in size) works very well. Also use 2-3 bottles of the Red Line water wetter with it. Upgrading is a definite Yes, from me.
Ford discontinued XL-17 many years ago. The reason was - it had a short shelf life, most of the carbon black would end up sticking to the bottom and sides of the bottle.