Well I have a 2063 which RRRIIIPPPPPSSSSS just like I like it for the Picco 21 P7-based engines(Nosram 21RR and Jammin JPX 21's for ex..), and got the JP-4 cuz everybody seemed to be running them.. I'm not really racing though, and will be using the JP-4 mostly in a DM-1 onroader - with Losi 454 most likely.. Ain't buying any more new pipes.. If anything, need to sell some...
Have a hard ano 053 for the Go - which I really liked on my Caster Grenade, but right now I have the 2063 on the Go and really like how it runs and tunes...
http://www.youtube.com/watch?v=JjNOlz-3Kek
http://www.youtube.com/watch?v=-hINnJIx53w
The JP-4 looks good here though:
http://www.youtube.com/watch?v=bZ6OW...507F1B&index=4
With the Losi 454 it'll be the same set-up...