When people say they have straight pipes does that mean they arent using a muffler, its just an exhaust without a muffler.

 

yes

 

So alls I have to do is take the muffler off and put a pipe in place of the muffler

 

Its a little more than that. You still have resonators, catalytic converters and anything else that is in the way. For sure the term straight is anything but that.

 

so having straight pipes is legal, just wondering because you said you dont take off cat convertor???

 

having striaght pipes is ILLEGAL because you are supposed to have a muffler. However, depending on where you live, its not that big of a deal. If you have an F-150 that has 4 cats cutting the second two off will not affect the o2 sensors or warnings lights and make the truck louder