on a previous thread I questioned this and a fellow speed member quoted;

VEGAS BAIL
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2004 Porsche 911
Join Date: Feb 2009
Location: las vegas
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Be advised ......I have a law suit going on with this company right now... I gave them 10,000 for a ecu tune, Intake, Diverter valves and couple other things.. When i got my car back, i had it checked out from Evolution and i was told that nothing was done to my car.......Stay away from them.....The guys name there is Ralph Biase and they have tried serving him papers and he keeps avoiding it...BE CAREFUL

 

Supposedly an X uses alternating exhaust pulses to draw exhaust from the cylinders. As one pulse goes through it creates a vaccum that pulls the next pulse down the pipe. Supposedly. Different schools of thought and perhaps more fabrication. I like what you did with your's though, looks fairly straightforward to build. Losing the drone is HUGE! What size pipe did you use and was this hard to construct? Mufflers? Any pics on the car?

 

it is 2.75 inches I think. It is very straight forward and fairly easy to build. Unfortunately the muffler shop I had do it, was very expensive and I got hosed on the welding part, but other than that it worked out very well. It weighs 24 lbs with the cats. The way I secured it to the car was with large hose clamps that go around the exhaust and tighten to the prongs that use to hold the factory exhaust. If you get a good enough shop, they can probably copy this design fairly easily.

The X-flow design has several schools of thought and the alternating pulse is one and in the low rpm's it probably works, but the higher rpm you go the less the chance of this working well. I prefer my idea and a few people who I talked to about their x-flow said they did not get rid of drone. one of them has been running an x-flow style exhaust for sometime, like a couple of years. With the H-pipe you get the balancing and you get no intereference between exhaust streams. of course all of this is conjecture as there is no real world testing. All I can verify is that at the track, my trap speeds went up after going from the straight pipes to this exhaust. I don't know if the exhaust had everything to do with it, or if I just got better, but at least I know that it did not make things worse.