Hey guys, I just put some lt headers on my truck and seem to have lost a bit of low end power. I know that it was supposed to gain high end, but didn't know I'd lose so much low end. Used to have to be careful taking off, so I didn't spin tires, but now it can't when I mash it.

 

Did you re-tune after the header install?

 

somethings wrong? you should gain a good amount of torque with LTs. I felt a difference everywhere right after my install.

 

Ditto
My money is on "NO"

LTs will gain a noticeable amount down low.

 

I felt I had a little loss from a stop also with the longtubes. Once rolling, it moves out, but it did move my power band up a little. In the upper rpms, it pulls way harder than before. I always thought it was because I have the loudmouth muffler on there, going to a magnaflow soon to try to get back a little low end and also to quiet it down.

 

I can bust loose from a stop and They will even but loose if I mash it at 30+mph no loss and all gain here

 

that might have something to do with the lq9

 

headers can be tuned based on the length of the collectors. Longer or shorter makes a difference, make a mark lenghtwise on the collectors with a crayon or grease marker and take it on a hard run then check the mark. Where ever the mark burns down to is where you want to cut the collectors at. Here is a link to a discussion on this:

https://ls1tech.com/forums/showthread.php?t=69745

 

You won't necessarily gain low end. In fact you'll probably lose quite a bit of low end if you're running a 4.8 or relatively stock 5.3L.

The problem is that you probably went with pacesetters which have 1 3/4" primaries which are great for modified trucks, but terrible for stock truck which see very little top end. You probably gained quite a bit up top, but you almost for sure will lose low end.

 

thats what I got, pacesetters.