The lm1 was first designed for the 4th gen GM fbodys, I love mine because it just has that muscle car sound to it, I have the magnaflow tips on mine now before I just had 3" stainless tips. Ill tell ya they sounded like the 89 f150 glass pack truck, with the magna flow tips it mellowed it out really well. Its only obnoxious at 3/4 throttle and up. IMO its all personal preference but if you ask me SLP all the way, esp for the money
Borla Stingers are my favorite sounding mufflers. They are VERY loud and aggressive sounding, but actually have a nice tone to them (unlike the LM1s, which sound like garbage). Magnapacks come in at a close 2nd for me (for aggressive sounding).
Just ordered some 2.5" Spintech Super Pro Streets. Also having new 2.5" tailpipes made at the exhaust shop as soon as they come in. The super pro streets are supposed to be a super agressive muffler. I will get a sound clip as soon as I put them on.