Don't know if this counts, but after installing the dejon intake and intercooler tuning, then the Hahn catted DP and a mandrel bent 3" cat back and a borla muffler. I have my LTFT's down to 3.5 and still working on them, I used the tune from BYT and i spike 24psi when i first tip into it and then it drops and holds 21psi. Traction is a problem in 1st and 2nd, third pulls hard as hell. no dyno yet to put a number to may mods, or any track times. i can easily pull away from my friends 02 Z28 and he runs 13.4 bone stock. Here is a sound clip of my exhaust.
http://s143.photobucket.com/albums/r...rlacatback.flv
let me know if you like it. I'm thinking i'm going to put a resinator in it to calm it down.