so ive read the y pipe b4 the cat is restrictive, im cuttin the cat off bc its glogged jus after the o2, then running pipe back to a flowmaster 40, is it true that y pipe is restrictive? should i just buy a new one?

 

That's what I've been told. Been doing lots of research and question asking... I think I seen the jegs off road y pipe if your not running a cat.. pretty cheap. If u want the cat then the Magna flow high flow cat and y pipe direct replacement.. http://discountperformanceexhaust.co...5-p-20291.html
That's the one I'm getting. Cheap price too.

 

2001 exhaust isn't the same as the earlier years. And it probably won't be the same for a 5.9,

wait do you have a 3500 gasser, or diesel?

 

its a 2500 gaser i call it a 1 ton bc of all the heavy duty **** its got,

 

I can tell you without doubt, the Y pipe on my '02 was a hideous thing..

it basically took the two 2.25" pipes (off the passenger side collector, and from the drivers side crossover pipe) an lined them up with a 2.5" single pipe, took a sleeve of pipe maybe 3" in diameter and squeezed them together as a sleeve.. like reminiscent of 'shrink wrapping'..

think this way- instead of the pipes looking something like this:

O
o o

they looked like this:

O
db

The two pipes leading into the junction were squeezed, like trying to shove two drinking straws into the same hole on a fountain drink cup's lid.. CHOKE central..

 

im looking to order the magnaflow from the site posted above.
but does anyone know if the pipes in the picture are included ??
and will this help with performance , and / or gas mileage ??
please help :/

 

I got my magnaflow cat from the website listed, it comes with the y pipes and the pipe after the cat, your just going to need to weld the driver side y pipe to the cat.

Idk about much performance gain, but it sure does sound a whole hell of alot better.

 

So i did a search on magnaflows site, and it seems they dont make a setup like the one posted for your truck, you can only get the cat and not the y pipes for your year. so maybe if your place of residence doesnt do emmisions testing you could just gut it or straight pipe it