Originally Posted by bmarcinczyk14

yes, thats true about the built in pre-cat on the sentra, not only that but that pos pre-cat is know to break up and get sucked into the engine, so on the sentra not only is a header a performance mod, but also an reliablitiy one too. also on the sentra se-r's intake manifold, it has two sets of intake ports, 8 total, one set is open all the time and the other set is closed off with butterfly valves untill the engine hits 5500rpm, then the second set opens allowing more airflow through and also making the engine louder and deeper. why doesnt the vq engine have this design? i would think it would allow more power.