Mine are the LM2s with magnaflow catted X. Acer's are LM1s with MAC catted H.
I made 2 clips of mine just chillin in the driveway. One about 10 feet away, the other 15 feet.
http://nanaki.realns.com/LM2.wav <--10 feet
http://nanaki.realns.com/LM2_2.wav <--15 feet
http://nanaki.realns.com/LM2_driveby.wav <--drive by of my LM2s. i ran out of room to stay on it (road and gear).
Here's Acers. He did it right the first time from 15 feet away.
http://nanaki.realns.com/LM1.wav <-- 15 feet
http://nanaki.realns.com/LM1_driveby.wav <--VROOOOOOOOOOOOOOOM