Pretty much any free flow header on a 4-cylinder will be LOUD. I would recommend a really good resonator, and a solid muffler.
When I had mine I ended up running the a High-Flow cat, a Flowmaster HUSHPOWER2 Resonator (the largest one they had available) and the standard DDM/Solo cat back from there. The cat and resonator cut down the noise alot.
I initially had it running through a test pipe with only the turbo style muffler to dampen the sound... big mistake. It was deafening and raspy, which is really unavoidable in NA 4-bangers.