new 6.0

clean nali man...anymore pics

Dynatech LT's with HiFlo Cats works & sounds great. Expensive but worth it

try to get more picks up soon trying yo link a video what am i doing wrong? thanks for all the info. anyway search 05 sierra denali on youtube

Welcome to the forum and nice truck.

As far as recommendations, I would say sell the throttle body spacer and skip the high-flow cats. The stock cats flow just fine. You might look into OBX headers to see if they make them for the Denali. They also come with resonators that are a straight-through design but look just like cats.

thanks for the help although i have not been able to find any LT's except pacrsetters

Welcome man, google obx silverado ss headers or sparkteckmotorsports and you'll find the obx headers.

thanks sierrass so these should fit the denali also

Yes they will (should)and are around 500 shipped. Cant beat that. I've talked to a C3 owner on another site that is running them and loves them and said that they went on fairly easy with no clearence issues. But im shure that evry truck is a lil bit different.

Here is a link to the headers.

OBX Stainless Steel Headers: 99-05 Chevy Silverado SS - Sparktec Motorsports

Stainless Works or Dynatechs FTW.