Re: X pipe or H pipe
I put a MAC H Pipe on my 98 v6, and it definitely makes the exhaust growl a lot more than with an X Pipe. My future brother-in-law has the x pipe on his v6... and yes, it's a little louder, but a lot raspier than the h-pipe.
And with performance... they are honestly about the same... I have read that the X-pipe has a little better flow, but how much? 1 hp?... not enough of a difference if you ask me.
*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)