I have a fully-prepped 2nd generation Integra I will be running ITA and a few Honda Challenge races with this season. I don't know anything about Spec Focuses go... but at least for H4 competition, a built B18B1 has a good bit more grunt than the CRX. It doesn't brake as well as the CRX and the ultimate cornering speed is a little lower, but it's a much easier car to drive fast when set up properly. It's very stable. There's a lot of aftermarket support for the car, both in terms of parts and setup. Let me know if I can be of assistance.