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Anyone know of any differences in the different years of the Lb7?

The reason I ask is because my 03 sounds very smooth, my 01 doesnt. And the 01 has a reman motor with less miles..
 

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The 01's are a slightly different in appearance than the 02-04 but nothing that would make it run rougher than the newer ones.

My LB7 wasn't very smooth a couple weeks ago, the only difference is I've installed larger injectors and adjusted the valve lash. Now it idles and runs super quiet compared to what it used to, the twins quiet it down and smooth it out quite a bit as well.
 
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