I hae the power pack on my v6. I think it helped acceleration noticealby. You can build your own and maybe come out a little cheaper but not by much for the exhaust especially if you got a v6, and CAI. The only negative thing i have against the power pack is the tuner. It has one tune plus the stock tune, I much rather would have the diablo sport or SCT2. The price on the site said 1300 when i looked into it, I actually got it for 875. If you call around you can find a good deal on it. Overall I would reccomend it.
2008 v6 Pony Package.
Performance mods: Aluminum Driveshaft, Screamin' Deamon Ignition Coil, Red Livewires... and an STS turbo kit with an intercooler,and water methanol injection.
5 psi~ 286rwhp, 331 rwtq
Other Mods: Window Louvers, 2 10" MA subs, 1200 watt RMS Hifonics amp. Tial 50mm BOV.