okay well i'll hold off on the headers for right now then... cause i have been wanting to do true duals for a long long time.... and maybe it be worth it to do long tubes and true duals

 

hey you is also phychic lol

 

Psychic? Psychotic? Something like that.

 

I keep reading that the stock y pipes (2") cram into a 2 1/2" pipe. I climbed under mine and measured all of the pipes. The 2" pipes come from manifold and each one enters a separate entry point in the cat. Is this not the stock set up on mine?

 

Looking in the 99 parts book, what you have is stock. You are part way to having dual exhaust, and no crappy y pipe.

 

Would i benefit from changin the 2" to 2 1/2" pipe and changing cat if I can find one with 2 1/2" inlets? It has 2 1/2" from cat to muffler, and then 3" after the muffler. Muffler is unmarked but is about 40" long.

 

hey gdstock...do you have custom tunes from hemi fever? or just regauller canned tunes?

and how do you like it.. i'm on the edge of ordering the programmer today

 

The model years that had a dual in cat should really consider trying to find a set of the Doug Thorley tri-Y headers that are occasionally seen about. That's the best compromise of low end grunt and high end gains to be found.

The 2001 model year is a strange animal. My truck does indeed have a Y pipe into a SI/SO cat. However, the y pipe ends in a 3" compression, not the earlier 2.5". It had a 2.5" reducer and expander on each side of the cat and muffler, and went back to all 3" pipe everywhere else. I had my exhaust guy cut out the reducers and ran 3" SI/SO cat and muffler and now I have a full 3" exhaust system.

It is the damndest thing I had ever seen. I think dodge expanded the piping on the 2001 model to 3", (which is where they got the extra HP claims over previous years) but used left over muffler and catalytic converter stock from the 2.5" pipe days.

Bottom line is, if you've got a 2001, check it before you assume anything.

 

i have the same setup that you have my Y pipe going into a 3in then to my cat then its 2.5 back to the flowmaster muffler then to a 3in tail pipe.

i thought it was werid as heck to when i did my exhaust last year..

 

It seems to me that twp 2" pipes (total cross-sectional area of 6.28 in^2) going into one 3" pipe (total cross-sectional area of 7.07 in^2) would be very efficient and not call for an improved y-pipe.

If it were going into a 2.5" pipe that would be a cross sectional area of 4.91 in^2, which would be bad.