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When I talked to them a week ago they were still trying to figure it out, but had no idea how long it would take. I cancelled my 2 month old order and ordered the new Corsa system.
I talked to Brian at length last week about this. They are still not happy with the sound of the system ie resonance. He said that so far the only truly resonance free system that they have come up with actually cuts horsepower a little. Actually only one or two hp, but they will not produce and sell a product that reduces performance.
They want to do it right and won't release it until they are happy with it. Good people, great products. That being said, I also cancelled my order and am going to try the B & B Route 66 PRT system. I have a very bad feeling that I may wish that I waited for the GHL product, but will find out before too long.