You already have the headers, I'm not sure if it's incredibly hard to DIY if you know what your doing. But I highly doubt the dealer will install your stainless headers. Call and ask them.so i search and search for a way out of not paying $700 in labor to replace my headers. im at 77000 on my 05 titan. and from reading and reading on this site i found out that im covered im happy just not 100%. i still have to call tuesday and make sure im good to get them replace under the 80k warranty. but my question is would they install my stainless steel headers instead of the oem ones. thanks for the help.