do i need a re-map?
 

having just bought my first impreza(wrx 94 wagon) i would just like to know if i need to have it mapped?
the only mod it has is a 3" exhaust system fitted(some weird sounding japanese make)
not having any history with the car can i be confident its been mapped to the exhaust?
it runs fine and pulls like s**t but then my last car was a bmw 316!!!
thanx for your time