Alright, I am looking for new mufflers for my new K5. I want something louder than the "midas" that are on there, but I don't want it obnoxious! So, do I get Flowmaster Series 40's, Series 50's, or 20" Thrush glasspacks? Anybody out there with any of these mufflers? 1977 Blazer w/ 350 GM crate motor 44 front/ 12-bolt rear, gear driven NP205 31x10.50r15 BFG All-terrain- Larger on the way!