I bought a the following for $1,395:
Used Accessport $495 shipped
Used Cobb Catted DP for $300 picked up
Used XO2 Racing Catback for $300 shipped
Used Catless Up Pipe free
New GrimmSpeed ported and coated exhaust manifolds Less then $300 shipped
This could have all been done for cheaper by not having a catback, gutting the stock DP and not buying a PNP/Coated and produced almost the same HP. Speaking of HP I don't know what I have at the crank but Cobb says that a standard stage 2 tune is 22% HP gain (305HP) and a 38% TQ gain (345TQ). That is a conservative Cobb tune. If I had a Pro Dyno tune instead of buying the PnP/Coated exhaust manifolds I'd have more.
Long story short, it isn't really a stretch. [/sillyrant]