Depends on what you want to do really.
Bonneville: High flow cat, new 2.25" pipe, Stainless steel Magnaflow muffler, Stainless Denali tip: $900 or so installed with taxes
Aurora: Dual stainless Magnaflow mufflers, dual Ractive tips, new pipe from Y-bend back: $700 installed.
I'm looking to do high flow cat next on the Aurora, but my stock pipe is still in awesome shape..no need to replace, the cat with be about 190 bones installed with taxes.
I can get pics, gimme some time tho
my Bonneville is owned by my buddy, so I have to go to his place to get pics, check my www link at the bottom of my posts for some Bonneville pics, I can show you the Aurora set up later