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Hi Adam
I think contry to what was written above these exhausts were developed recently from the car racing industry, an industry that if your doing well with any modification you tend to want to keep it quiet to preserve your advantage. The company decided after developing the exhaust in motor racing to expand their market into cars and trains. The idea behind the exhaust is to speed up the flow of the exhaust by forcing the outgoing exhaust gases through special shaped compartments that both compress the air but also force it to spin at high speed around the edge of the exhaust, thus lowering the pressure in the system, this in turn lowers the pressure in whole exhaust system, lowering any back pressure and encouraging better scavenging of the exhaust. (I hope I’ve got that right)
As far as results go I had only had the van for a couple of weeks and hadn’t done any serious fuel consumption figures, but I do also have a T5 that I have put 100K on, and had driven the T6 for a couple of hundred miles and found it very thirst. I was expecting it to be a bit thirstier as a 4x4 but not quite as thirst as it was. Putting on the exhaust immediately reduced the fuel consumption by some 15% and improved the pick up from high gear low speed situations. The only practical example I can give you is the 180 mile journey from Bournemouth to Greys in Essex to the exhaust fitters. On the way there I used a quarter of a tank, on the way back I used an eighth of a tank, that to me was an observable improvement. The trip was made in similar traffic conditions using cruise control as much as possible to take my right foot out of the equation. I also have to admit that because of our planned charity trip to Mongolia next year Vortex kindle gave us the exhaust and have agreed further sponsorship. This has not stopped me sharing my findings with this group as I feel this is a good product. Apparently the exhausts they fitted on to trains have even more spectacular success and have saved them so much money that they have been able to lower their fuel and tax bill. We have also received sponsorship/help from VWCoast, Zunsport grilles, Revampavan and T4 Conversions, I’d wish to thank them all for their help and wish them well in the future. I am also just starting to work with a company to build a long range fuel tank that will occupy all the left hand side of the underneath of the vehicle going both forward and rearward from where the current tank sits. I am hoping to double the tanks current capacity. I’m sure there will be challenges on the way, but I will let you know how I get on. I am also looking for someone to supply or build a swing away spare tyre carrier for the back of the vehicle, (not the bike rack that goes on the door itself) if you know anyone please let me know.
Ian
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oh sh*t balls 
