yeh this would be my first sirio based motor ...but everyone i have seen run ...seemed to have an endless amount of top end ...planning on really running a 2053 grp on chads recommendation of the pipes i have ...im sure i will try the 053 and the 086 as i have both as well ....most of the tracks im running on are not very long straights ....so i dont need as much top end as i need bottom to mid transition .....mark smith at powerhouse finished me up and i had him mod it to lend itself better to the 2053 grp to try and smooth it out a little ...should get it back tomarrow ...but prolly wont run it for a bit ....still gotta have a few more tanks through the grp and replce the bearins in it ...then im gonna strap up the extech