What size pipes should i run

[Reyray20]

i just got my new universal hi flow magnaflow cats. and i already have a single in single out magnaflow muffler. my question is what size pipe should i run after the Y pipe back?

 

[retorq]

3 .. 3.5 ... it depends on your engine and what's before the muffler and cat(s) ...

 

[Gzes]

id do 1 in 2 out. and do bigger in pipe size if you need to.

 

[07Burb]

I've always ran 2.5" pipe for my exhaust in all my vehicles.

 

[992dr]

I have run 2.5" in all of mine as well accept the Hoe. I ran 2.5" Y'd into 3" over the axle. But, thats going to change. All 2.5" front to back.

 

[ezdaar]

single pipe, min 3".

since your doing some work, have This installed as well. you will be glad you did. Its best flowing Y pipe merge available without going custom. $39.95

 

[Gzes]

yep listen to ezdaar. mine came 1 in 2 out factory and yep it looks good. i doubt its expensive and will save alot of swearin trying to weld it up right

 

[ezdaar]

read this. for some insight.

 

[Reyray20]

Thanks for the advice im gonna go with 2.5 all the way through and get that y pipe as well

 

[ezdaar]

That merge is a 2.5 to 3". If I was you I would run 3" all the way back.
Just makes sense if you have ANY plans for more mods down the road..