I'm just curious from your collective experience if going through the trouble of adding headers and cat-back exhaust system is worth the trouble and expense for the additional HP you get?

My L currently has an 8-lb underpulley, reprogramming and a shift kit.

Also, what mufflers would you suggest. I don't like the Flowmaster sound, but prefer something a little higher pitched. The deep rumble doesn't do it for me.

Thanks for the feedback.