Not when you work on a 1099

 

For those who have these.... Anybody dyno with them after a nice tune?

 

my truck is getting a custom tune friday. i will post my base line and final numbers.

 

Great. Thanks for keeping us updated.

 

I'll let you know how they fit on a 4x4 as soon as mine show up. I figured since I'm swapping from a 4.3 to a LQ9 and have to switch out the y-pipe anyhow, I might as well do a bit of an exhaust upgrade while I'm at it.

 

Excellent. Thanks

 

i got a buddy with an 03 ecsb z71 that bought some last night. i'm gonna help him install them when they come in so I'll let y'all know in a couple weeks or so.

 

just got off the dyno 300whp and 334wtq

07 gmc 5.3l

-obx longtubes
-magnaflow single cat back
-aem intake
-hptuners custom tune

 

That sounds pretty good. Did you have a base line dyno run before the headers to compare this to?

 

no, what do most 5.3l put down stock?