Brazilian Dodge Dart 76 (similar to 69 usa)

alex_borges_br said
probably I will use mufflers... But I have to save money for a while :D :D

the problem with straight pipes is noise. A 2 hour travel will turn into a 1:30 hour of wife torture

Being married myself I would concur and If my math is correct that would equate into a week of pay back misery for you...maybe a week and a day.

I digress.