There is one more really good GT engine available on the market, still a bit restricted as it has to launched offically still on a global level, but it's available. The WERKS GT engine was launched early this year exclusively in Brazil and has already achieved some impressive results. The engine is definitly on par with the top GT class engines, is very durable and has an excellent cost / benefit. I have now over 5 gallons on the prototype engine (which by the way won the State Championship), and it's still going strong. If you want to see some pictures, please visit us on facebook under https://www.facebook.com/werksracingbrazil/ and if you would like to get such an engine, please get in contact with me on facebook.