he said "i will build the 3.8 naturally aspired, no supercharger."
basically you can do the mods in my sig, then rockers OR cam(not both), then heads if you want to spends lots of money. 3:29 or 3:69 gears in the tranny would help acceleration also.
If you don't want to get headers you can get a Plog & downpipe from zzp, easier to bolton then headers
but in the end you will be only be as fast or slightly faster then a gtp, I am happy with the power I make in my N/A and will be getting ER rockers from zzp in the spring, but some ppl want more power then what a GTP makes