I would guess that you would need a 4" downpipe to fit the year turbo you are going to install, and you'll have to clock the housings so everything lines up. Might have to play around with the compressor discharge a little, but I would think it to be a pretty basic install. Just curious, why an HX-35? Just something you got hanging around the garage? There are alot of turbo options for 3rd gens. I am pleased with my BD single for now, but will probobly need more turbo later. Good luck!