firebird, you are right. wikipedia says the same thing.
there is a differance though, i think, if you play with the header.... which will provide more bottom if its shorter... i red that somewhere on the net.
but anyway, you are right bro.


RichardTF, i own the HPI polished +21 and it rocks on my M26SS (TeamLosi Aftershock) i love it.
As for the Associated tuned pipe, i dont know how it performs.

But then again, the HPI works well on my M26SS.... does not mean it will work well on your mill...

I heard the Losi Hi-Torque is an awesome pipe on most engine... you might want to try it out. Thats the one i wanted but i ended up getting a good deal on the HPI... and i dont regret it.

but you have a Volcano SV? the hpi might be too big for the small mill .18 you have in there... (will not even fit on your frame!)
I suggest you grab a 1/10 tuned instead... the HPI and LOSI HT are all 1/8 (way too big for a volcano i think)
any opinions?