i just orderd some 4 inch pipes for my truck, right now all i run for exaust is a turn down right after the transfer case. is the 4 gunna give me better proformance lower egts then what i am running now, also how loud are the 4 inch. mine now is realy loud thats what im trying to fix

 

Yes you will see better performance. Mainly, lower egts. Cant tell you on the noise, its been TOO long since I ran 3".

 

3'' pipe is a fair bit louder than 4''. You should be happy with the new setup

 

so the 4 inch will be quiter then the 3s

 

The bigger you go the more throat it gets. in my opinion 6" pipes sound the coolest!

Right GREG??

 

if they would fit under the truck i would have them already too