long tube headers, gains, what did you notice?

[dtmmil]

I have been looking into adding headers to my 97 burb, started thinking, what would I gain. What did those of you notice for gains by doing this, did you notice power gains, mpg gains? And did you get it tuned when done?

[Low97tahoE]

to be honest, with the right muffler, it is the best thing you can do as far as bolt ons go, i had pacesetter longtubes on my 97 tahoe. i used the supplied reducers with band clamps and then had the muffler shop run 2.5" from the collectors, into a dual 2.5" to single 3" Magnaflow Y (costs only $26), no cats, but theres room for them if u need em, then into an 18" magnaflow. i noticed about a 1-1.5 mpg increase, and unbelivable throttle response and power increase. it was night and day. i could roast the tires until i decided it was enough. and it sounded like an eargasm

i had a custom tune prior which deleted the egr and rear o2 sensors so it was already tuned and ready to go

i have a couple youtube videos under this same username but it just doesnt do it justice unless ur computer has a sub or something u just wont understand how good it sounded

[dtmmil]

Cool, thanks! I will check out the vids! What size were the collectors, I noticed some I looked at were 2.5" not the 3" I am use to seeing. Right now I have no cats, dual pipes to dual in dual out flowmaster muffler, which is about to rust through, and dual 2.25" tailpipes. I am looking into a magnaflow muffler.

[Low97tahoE]

Cool, thanks! I will check out the vids! What size were the collectors, I noticed some I looked at were 2.5" not the 3" I am use to seeing. Right now I have no cats, dual pipes to dual in dual out flowmaster muffler, which is about to rust through, and dual 2.25" tailpipes. I am looking into a magnaflow muffler.

yea, Magnaflow is proven performance and great sound, with headers my 18" magnaflow was pretty dang loud, plenty for me, plus i had an electric cutout when i wanted to make some noise. mine were 3" collector, and came with 3" x 2.5" reducers and i ran dual 2.5" into single 3" from there