Speed Daddy headers all the way. I had a 3" DP in mine, and yes, the butt dyno approved, but it cost me over $100dollars..
Headers are just over $200, and flow WAY WAY better.
If you get new clamps and some RTV (like 30bucks total) they seal perfect the first time. Also, mine fit together great, did have to squeeze the Crossover a little but nothing terrible at all. Been leak free for comming up on 9months now.
There are install write-ups also on this site, and it takes about 3-6hours depending on your skill level.
