What are the best intake systems I can get for my 5.3 Sierra
What are the typical HP gains??

 

I would have to go with a good flowing filter and a replacement tube, then do some of the free airbox mods from the site. I have had three different types on three vehicle and none really helped like they clamied. Do a search for some of the mods.

 

Go With A Trueflow, I've Had Three Gen Iii Powered Vehicles And Each One Gets A Trueflow, It's Dyno Proven. Beware, Don't Get A System That Leaves An Exposed Filter, These Supposed Cold Air Kits Should Be Called Hot Air Kits.

 

Who sells them??

Are the free mods really worth it??

 

Honestly, most of the intake systems produce pretty close gains on the dyno. If you want something cheap do it yourself...

 

i have the volant with the power flow tube, and i got maybe 13-14

 

I would go with the AEM Brute Force Intake system I have it on my 2005 GMC 5.3L. I can tell a noticeable diffrance in power and it sounds great to makes the engine sound throughty and mellow.