The Nova 9853 is the best buy far besy milade and power everywhere the thing about the grp 2053 pipe when we ran it was it ran wormer then the other witch we do not want to do it was around 225 compaired to the others around 200 or cooler so with that the nova 9853 it best then the sirio 2013 so far we have a little more testing with different headers on the pipes now then when we get what we want Colby or I will post it hear so everyone knows what we recommend to try.I can say with the 086 we ran the C header we are going to try the nova D header on it this weekend as well to the 086 maked grate power but is to more like a on off switch on teh top end if the D header helps take that away like i'm thinking it will it will be a very good set up to run as well and does not cost to much as well very strong we will post that hear sometime sunday.

The jp 4 was very fast as well but had a dead spot just off idle it is just the way that pipe ran other then that it is not a bad choice as well.

Trever