I have done my gas conversion of my car with them. First year was ok. Problem started from the second year. Car started to vibrate when run in gas, eventhough it was running smooth on petrol.They did servicing, came back home and realised the original problem is still there. I had to go back again. This time they changed the plugs. After that car was ok. Just after 10 months the same problem started. I went there. I was informed that the gas cascade needs to be replaced. They change that. I came back home and found the same problem and realised, there is a new problem, I cannot accelerate properly. I went back for the 2nd time,,,this time they changed one coil. On these two occasions they took whole day and I had to pick the car on the next day. The car was ok only for 2 weeks and the problem came back!!!! I rang them, the person was not sure. I had to go back to them again. This time they changed rest of the coils (5). It looks like they are not sure what they are doing. As if they try every thing, whichever works!!!! They even tried to convince me that it was the problem of my car, not for the gas. Within 3 weeks I had to go back twice and I had to pay around $1200 !!!!!! I will not recommend them.