I have run the P5xlt, fire11 and BXR.
Fire11 is just a beast but seems to be a wee bit to much for me with the power delivery in my serpent truggy but still loved it..great on fuel.
BXR i am running with the 2087pipe and 198 header which proberly isnt right but its a great linear power easy to get the right throttle input and goes really good top end is close to the Fire but a bit more responsive...not as good on fuel but alright
P5xlt is a CRE modded...just awesome like the best bits of the fire and BXR put together...but i can drive faster with the BXR for some reason