This is something that I just can't seem to decide on.

I'm gonna be running a 2.6" pulley, 60's, ported blower, ls4 tb, meth and a few other little things to add hp. I currently have a 3" catback but I'm wondering what size dp and header I should run.

I don't want to lose low end tq from a 3" combo but I don't want to choke out up top if the 2.5" is too small. Anyone have any advice on this subject? I'm already in the process of my build and sending off the blower to be ported soon so any words of advice would be great guys!

 

My hp and tq curves with the mods in my signature.

 

but is that with a 2.5" or 3" dp?

 

all 3" lol my bad thought it said.

 

That's 3 inch

 

damn then I better go all 3" cause I'll have more power haha. Thanks bro. Hope your 60's do some work for me too!

 

what size cat-back do u have

 

me too haha

 

3" custom with magnaflow components. I thought that having a 2.5" header and dp combo would cure the low end tq loss but with that dyno graph, I'm sold on full 3"

if you have any other good parts, PM me and let me know man!

 

i ahve a hahn catless 3". same one ran on that setup. right now its going to a guy in kc, mo though along with the hahn catback. shipping would be about $60 though on the downpipe to go to florida. i'll let you know if it falls through. i'll know today or tomorrow.

 

keep me posted