Hi there guys i have an 09 denali.. i have my 1 3/4 + cats in my garage.. and i have a chance of upgrading it to 1 7/8 + cats with no charges... ill be doing a H/C a week after the installation of the headers.. i called nick @ ARH and said that it could support up to 500hp ill be expecting around 400-430... so is the upgrade worth it?

regards

 

upgrade to 1 7/8, dont even think about it.

 

go for it IMO. i went from the 1 3/4 to 1 3/4 stepped to 1 7/8.