It didnt rob to much power. When we had it. Still made the correct amount of power. Actually made more power than SOMEBODYS STOCK H2b with a Carbon Wale penis! but ehhh... Who knows....
I figured he was referring to nemos stock h2b
From what i have seen h2b's love the bigger piping...One guy has a 4"-3.5"-3" on a stock motor running 12.1@111 , and ive seen some others making good power with at least 3.5". Im reducing mine to 3" at the TB
11.7@116- All motor H2B Integra