I've been on this forum for little while but just recently in the last month or so i actually went ahead and bought a 98 GTP, that being said i'm having trouble finding the DIY mods on the site, i went through almost all of How To Write-Ups/Tech Tips and general tech but i can't find the following how to guides

-Cat/Resonator remove
-DIY open cone intake

and any other cheap performance mods.