Originally Posted by FP
A piece of advice to all. Have your car dyno'd stock before doing any mods. This will give you a base line to compare your gains in performance with each mod. Use the same dyno as they do vary in reporting.
To follow up on FP's excellent advice, I'd like to see some dyno plots to know how much hp each of the mods are going to get me. I don't know about anyone else, but I don't like to spend money on mods that do not have dyno-verified gains. All of the things in this thread make sense, but how they translate into actual hp is up for debate IMO.
So if anyone has any before and after dynos of any of the mods listed in this thread, please post up.