I used to own a manual ca18de silvia. I prefer my r32 alot better, beter build quality and turbo aswell. However the ca is an awsome engine, So strong, and so cheap. A ca has so much potential, Not saying that sr aren't good, they r gr8 but there's something about a Ca that make me prefer it. It just better built. Neither though it's got nowhere the power in comparison in stock format.
Ca just seems smoother and just like to rev's it self way up int the high rpm. I've saw my ca go all the way to 8400 rpm, and i think it could gone even more. I ran out of bituman. They just go hard.