Okay i've finally decided to do something with the exhaust, I'm going to order some type of straight-thru muffler. What size should the inlet & outlet be on the muffler? I figure someone has to know and it's easier than crawling under the truck and measuring . Thanks in advance.

 

4&quot; in 3&quot; out<br><br> ;D<br><br>-Ian

 

Thanks! 8)