I wouldn't say the long tubes are worthless. The gains were across the RPM range in both torque and HP.
Having said that, I truly think the stock tune is severely limiting the power output of the headers for a variety of reasons.

Also, I had to switch dynos after the initial baseline as the owner of the baseline dyno shop became seriously ill. In reality the gains could have been more or less than those seen at the second dyno shop even though both shops had the same Dynojet setup.

I start tuning the combination you read about in this months GMHTP tomorrow on the Dyno. I will publish the results good, bad, or otherwise.

For the record, Stainlessworks was not surprised by the modest gains and told me to expect this until I tuned.

Thanks for reading the article

John Ulaszek

BTW, the truck in question is a 2004 K1500

 

John, thanks for coming in here and posting this info


I want some LT's for my 04, but didnt wanna fork out big bucks for no gains so thats why i was asking the questions

Thanks man