talked to a man today with a 99 cummins who swears up and down that after he removed his catalytic converter (ran straigt pipes) his fuel mileage increased 8 mpg and said he rewad somewhere on a dodge forum that someone else who had done the same thing had passed a state emissions check.
can this be right?

 

catalytic?????? my 98.5 and every 24 valve that worked with does not have a cat , they have a resonater (a sound killing device) however i dont know about the CA models. As far as the mileage goes ...my 98.5 got worse (.5 -1 mpg) all of the other trucks (15 or so) that i put a straight pipe in didn't change the milage at all ... but they sounded good !!!!

 

what is the advantage of going 4" all the way thru? will it make it louder in the cab?

 

on my truck at highway speed (65 -70 ) i noticed much less noise in cab with 4in straight pipes , it was louder at 1600rpm or so , but that was good for blasting someone next to you

 

My 95 and my 01 has a catalytic convert on it of some sort. When you look inside it has that honey comb stuff inside. Thats what I always thought it was anyways


I was wrong once before but found out I was mistaken. hehe


Jason

 

i dont know how many versions of the ram are out there the trucks i spoke of are from texas , most of my 12 valve buddies had cat's ... but none of the 24v's did may just be diff versions , i dunno

 

I just had mine replaced with a 4" silverline system and mine had a resonater (looks like a small muffler ahead of the big muffler). Here is a write-up of this (it is in the 5th paragraph):
http://www.bluechipdiesel.com/brief-education.htm
Hope this helps