I'm not running the pacesetter primary, just the secondary I have a hotshot gen 5 primary. The pacesetter secondary is 2.25".
I am going to be keeping an eye out for a used ssac secondary but I don't want to purchase yet another full header set for just the secondary part. (had to do that twice already for busted flex pipes), so now I have like 2 or 3 extra primaries laying around with no secondaries.