nah man,i dont feel any lose, whatever i feel is only gain 
yes at low end the gain isnt THAT much as compared to high end, but u know, game hi sari high end ki hai thats why the headers i have are of 4-1 configuration as well. they are better for high end.
theres a massive increase in throttle response too.
and thanks alot for liking my car 
keep the suggestions coming 