Freeway drive this morning

Since I installed the lithium batts, I have been testing in city driving, but I knew I did have the increased torque and top speed to drive on the freeway. So this morning I went for a test drive on I-5. Worked great! But I forgot that old cars have a LOT of internal noise on the freeway. It was like a wind tunnel in there! At some point I have to work on some soundproofing!