i just reinstalled my hallman mbc after a while of not having it on. when i had it on my boost spike was normal like most other people it would spike in a high gear like 4th in low rpms or something like that.

Now if im cruising in 4th or fifth at WOT it hits 20 steadily all the way almost
instead when i downshift into 3rd it spikes to 23-then drops to 20. i never had this problem its like one problem was fixed and another was caused.
this is the stock DV next week ill have the jdm mr-if it holds harder i might have even more of a problem. any ideas