You can make around 300hp with an hx35, but you have to run them hard and they life expectancy is fairly short at that point. Aside from some pump work or a small tune (24v) they are out of their efficiency range. The HE351CW will spool up similarly and provide more power from the drastically improved compressor wheel and housing. If you want more than 375-400 hp. I would recommend going with an s300 frame turbo like an s362 or larger. Thought typically something large like a 64/74/.9 will spool to slowly for most people on a second gen. Unless they have big injectors or actual engine work.