Problem with the speed

was out tonight n was given the car a wee kick on a private road :001_rolleyes:
the car got to 0-90 quick but took ages to get to 119 then wouldnt go any faster :S the only noise a can hear r from the exhaust sounds as though is spitting rather than running constant but get my new k-tec one tomorrow :smiley: but would this cause the problem ?

any advice or thought would be greatful :smiley: