Inside the car is illegal in NHRA but legal in NASCAR and SCCA. NASCAR runs the dry sump tank behind the driver's seat but NHRA doesn't allow liquids in the driver compartment. We hung the accusump on the rollcage inside the cabin on Tim's road race Valiant and that was fine with the road race tech guys but NHRA wouldn't allow it.

I will say that you don't want an aluminum tube full of hot oil inside the car on a street car. It is just like having a big heater sitting in the cabin with you. After 30 minutes or so the tank will be 180 degrees and the car will smell like hot oil!