I purchased an Integy performance Quad exhaust for my Traxxas Revo RC car. I received the item and installed it. As soon as I installed it, I had problem after problem with the exhaust. I checked Integy's web site for a phone number only to find an email address for tech support. I then emailed tech support with a description of the problem I was having. I received an email back with links on how to tune an RC nitro engine. I know very well how to tune a nitro engine, and the description I gave should have thrown up a flag to whoever... read full review »