http://www.spyder.tv/forums/showthread.php?t=8371, Take a look at this, Hossy put together a great thread with all kinds of info. Something to consider is going with a vertical adapter like the 15 degree Assault Block or Trinity instead of an expansion chamber and LPC. Both flow very well and have LPC's integrated into them and ASA threads for adding a Reg, only difference between the 2 is the assault block has a 15 degree forward angle and the trinity has a 15 degree back angle.