some questions please help

[cmx3d]

hey. i have a couple of questions to ask.they are as follows:<P>1. How fast acctually can a 93 gs mx-3 auto with a v-6 engine? my speedometer goes up to 150 and i'm not sure it can go that fast. Ive gotten it to 110 but havent tried to go faster.<P>2.Will i have to get a whole muffler system to get more horespower or will only the box with the outlets work?

[Q187]

Probably no higher than 136.