yay for more success stories!
i'm still trying to get my friend to get a set for his tahoe

 

I got the obx's. '05 2wd sierra. Used some wire protectors I already had by the hump. The band clamps included aren't at all tight on the smaller side of the slip fit pipes. I need to dent them because they're vibrating on the passenger frame rail

 

These headers plus the tune really woke up my little 4.8, the y was a real pain.Seems to run better the more i drive it many thanks to you folks this post was a great help.

 

It didn't seem to make a huge difference up top on my 5.3, but it really picked up some mid range and low end torque. Pulls way better in the bottom of 2nd and 3rd where it was dead before.

 

Always happy to read that this thread has helped someone. That was the intention and I really can't believe I posted it over a year and a half ago and it's still going strong.

 

You are the man, now I'm ready to start makin' some power and breakin' parts..lol..

 

6 months & no broken parts yet!

...well not because of the headers anyway

 

Just ordered mine the other day and they will be here next wednesday. I think I might be sick next Friday so I can put them on. Already ordered a EGR plate for the headers and will be picking up the EGR intake block off piece tonight along with some header wrap and copper RTV. There is a place that has them for the 320 shipped price, but not on ebay. Pulling my ecu this weekend so I can send it into Jessie for a retune.

 

Good deal!

 

Has anyone experienced sewing machine sounds, or a swarm of angry bees, or however you classify the sound of exhaust gases rushing thru the long tube headers? I have the stock GM muffler and no leaks, also verified by exhaust shop, no leaks. At idle I don't hear the noise, revving in park I dont hear it, but if I am driving with the windows down and say accelerating from a stop light I hear this sound, like rushing exhaust gases or noises being transmitted thru the tubes. Is there any way to limit this or eliminate it or is it just part of having long tube headers?