RE: HPI Racing MT2 engine replacement???
OS 18CV-RX!!
I have them in my RS4 and my MT2. Drops right in, very easy install, plenty of power, easy to tune. I have both of mine paired with a THS pipe.
I got lucky with mine. I found them on a forum, both were brand new. I paid $100 for one and traded for another.
If you get it, you should search on some forums. If you are patient, you will find a good deal on one.