for my 4.6, pypes o/r X + SLP LM2 = above 1400rpm sounded like a straight-piped chevy farm truck, trust me i had it. SLP bullets cut out and regular magnaflows welded in. Not to mention less blueberries & cherries in the rearview for noise violation.
Not sure how that works out. I have heard 2vs with it and I have the SLP O/RX with LM2s and my car does not sound like a straight piped chevy truck. Again im a 4v so the engine is more mellow then the 2vs. But its not that bad. Cant wait for the LTs. And I might even through LM1s on for the hell of it since I can.
Also the performance between an X and an H is so marginal, this should never be a deciding factor.
For those claiming droning. Remember, choosing the right midpipe has a lot to do with it, as does catted/catless. While most of the time an X is best for bullet style mufflers and an H is better for chambered style. The X is going to give more of an exotic sound where the H will give more of a deeper sound.
Plus personally Hs sound better on 5.0s anyway