i have a 96 integar ls 5spd. i never tested it stock but with just exhaust, intake, headers and stage 3 clutch i had it to 135mph before it started to dog. it took about another 6 miles before i acutally was able to burry the needle at the 150mph. so i i had to make an educated guess i would say 135 is where its "governed". I also know my ex gf had a 94 automatic and she couldnt get hers past 120. so i dont know for autos.