Quote Originally Posted by speedminded
...and thus you were wrong. If you aren't adding more fuel then you can't exactly add much power. No back pressure will mean a major loss of torque [with a normally aspirated engine] as well.

What year e36? The later model 328's have a stainless header that would be preferable over the older cast version. I'd leave the cats on, add a high flow resonator, and put a magnaflow on the back...
its a 1998, and thanks for clearing that up bro.