Honestly, at 150 in my stang was pounding because the front end was everywhere and it felt like i was floating. At 154 in the BMW it was because i accidently looked down at the Spedo and had only just realized quite how fast i was moving. Not to mention that the valentine one didn't go off when i turned off and there was a cop at that very exit (although 100ft ahead clocking people going the oppisite way). The Lexus which had been chipped was because the top was down and the air sounded like it was screaming in my ears. Errie feeling. i dont know how to explain it.