9xl on 4s lipo

Hey guys, have you ever tried the K4.6, with good fuel like Byron Gen2 race formula, and a TSAIS T-32 tune pipe?????

I can telll you that's a screemer, and i'am realy impressed of this little engine.
I like brushless, but my Savage with the K4.6 impressed me each time i run it.

And you know what?? I've an RB Concept TM 928 with FLM extend low CG TVP on order, suppose to recieve it next wednesday.