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go for teh 4.10's. you won't regret it.
there are good cat back options foir teh 3800, just order a cat back for a single cat LT1 car and you will have teh 3inch tubing the engine wants.
since your car is an "01 you already have the tubular manifolds. they are a pretty good start, definately good enough to make the available off teh shelf headers not very useful.
a good y-pipe is always a good call though. flowmaster makes really nice y-merges. i would sugest having an exhuast shop bend you up a y-pipe using a 2- 2 1/4inch into single 3inch y-pipe using a flow collector.
i always suggest a cat delete. it frees up a bunch of flow and power. a bullet style muffler can be fitted in teh place of teh factory cat to keep teh volume below teh radar of the cops/ballbusters.
a whisper lid + whatever brand of "ram air" helps a bunch too.
big thing is to get started with programming asap. the sooner you start tuning teh better prepared you will be to take advantage of each mod you add.
later
tim
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