Anyone ever used these?

[snowman44]

I have a 2016 silverado 5.3 with AFE CAI and flowmaster catback.  I live in upstate ny so the extra money for ceramic coating is well worth it.  Im going to get a tune this spring and wondering how much extra hp the headers would give me.  My truck sounds good as it is so if they are just for sound I'll ave myself the money.  Thanks in advance for your help.  .http://gibsonperformance.com/i-22731527-performance-header-ceramic-coated-gp137s-c.html#!year%3D2016%7C%7Cmake%3DCHEVROLET%7C%7Cmodel%3DSILVERADO%201500%2C%20LT

[snowman44]

Noticed those were short tube.  RIght now I am leaning towards the Texas Speed.  I have read some good reviews and are about half the price of ARH.

[country_09]

Love my Texas speed on both my trucks 

[Slapps74]

Kooks long tubes. The engine actually go rich if you don't have it tuned.