I already have the full Cattman catback exhaust but Im getting a deal on a used cattman ypipe. I just wanted some info on the gains, if there are any. I heard only the 00-01 benefited more from the ypipe b/c the precats were eliminated. Im guessing thats not the case for the 02-03s, so is it pretty much a useless mod?

 

the gains will be minimal due to the precats...full headers on a 3.5 is more comparable to a y-pipe on a 3.0

 

thats what I figured...thanks man

 

If you plan on stopping with the y-pipe then it's OK. Otherwise I'd save for the headers. That's a mod you're really going to feel.

 

you pretty much answered your own question

 

^irish44j said it all^

This thread is done LOL.

 

Since when was 23-24whp compairable to 13-14whp?

To the OP, a y-pipe on a 5.5 is like 8whp... Headers, over 20whp, you decide.

 

for the 100 bux im selling it, its worth it..lol

edit, with an intake and y i dyno'd 218whp/228TQ

 

If you are getting a deal, throw it on and judge for yourself. I don't think it can hurt. I love mine.

 

the increase % is comparable...

 

What about the mean increase?

 

the % is what matters since the HP is different to begin with

bottomline -
best single performance mod for a 3.0 - y-pipe
best single performance mod for a 3.5 - headers

 

Std Dev? . . . .

 

Fixed for you.