Well I never did get to compare them. I stuck with the pacesetters and have no issues with them. The only problem I had was a stripped 02 sensor bung, but it was an easy fix. The pacesetters are fine for those on a budget, and I'm pushing close to 400rwhp now. the 1 3/4 vs the 1 7/8 is negligable unless you are doing forced induction, I have a cam and it breathes just fine with the Pacesetters.