manifold back exhaust has been proven to lose power unless you get headers and the hp increase isn't much.
I have it all except the 1 & 2 and I have lightweight rotors and rear seats removed for more weight reduction. The weight reduction really helps. I've shed like 180lbs.
If you want a solid 0-60, using the launch control @5000 kills it!
I only timed myself once before I had the cams and I did a 4.9 (0-60mph) and a 2.05 60 foot, I let off close to 60 since I didn't have a lot of room.
I'll try and get some new numbers tomorrow when I take the car to get the belt tensioner checked, I'd like to see how the cams have effected my old time.