the mid or I pipe usually comes with a cat back system which is really a Y back but...thats normally where you get the 3 inch pipe (for the LS1's anyway).
CAI Cold Air Intake, BMR Strut Tower Brace, Gen5DIY Fog Lights,
Big Worm Third Brake Light/Side Marker Tint (Charcoal), GTS Tail Light Covers,
Purple Under Hood Lighting
Magnaflow Resonated X-Pipe w/ Muffler Delete