Hi, need some guidance and advise here. can i replace my Slayer TRX 3.3 engine with a HPI F4.6 ? ( taken from a HPI Savage )?. One of my friend being too generous and gave me his 3 month old HPI F4.6 engine. So instead of just let it sits on the shelf, i'm thinking of fixing it on my Slayer but need to know what is the modification or conversion kit needed? It will be great if some one can explain or redirect me to a thread / forum / post regarding this and some pics also will be just nice. Thanks