Hi all, I just installed my White Bros. E-Series S-bend on my uncorked 01 BRP. It ran great with the cored out stock exhaust. Now I get a low speed stumble when the throttle is cracked. Once it gets going it screams. I have the 178 main jet, 68s pilot and the needle clip in the 4th position. Adjusting the pilot does not help it. I currently have it at 2.5 turns out. Removing 4 discs for a total of 8 helped some but not much. It's not really that bad but noticable. Any suggestions? Thanks.