I just got the 07' classic will putting my cat-less exhaust and free flowing muffler cause codes to come on. I don't have my tuner in it yet thanks...

Unless you install a down pipe, you will not have a turbo back exhaust you have a down pipe back exhaust. And no a down pipe back 4" exhaust will not throw codes. I think the 05 has a different down pipe flange than the 07.

Some trucks get the check engine light for EGR codes, but most dont. If you do get the check engine light, it wont hurt anything, dont worry.

if u remove the cat u will get the egr code, and u can still drive it wont hurt it, if u dont then u will be fine no code

i want to put a turbo downpipe on my 07. is it a son of gun to put on? does it really make any difference? i can get an mbrp for $200, is it worth my time and money?

it will lower ur egts

i want to put a turbo downpipe on my 07. is it a son of gun to put on? does it really make any difference? i can get an mbrp for $200, is it worth my time and money?

This is the pipe that connects directly to the turbo??? can you give me a link id like to install one.

heres the part number from mbrp website
http://www.mbrp.com/index.php?page=products&make=Chevy/GMC&model=Duramax 2500/3500&year=2006

my egt's don't get real high now. i'm just looking for more hp and mpg for my dollar and my labor.