Can anyone tell me if you need the lamber sencor connected to the exhorst because i have a mongoose exhorst without a cat? If you do is there a way of testing the lamber sencor to see if it is working? The original lamber sencor was connected to the turbo on my escort, i changed the turbo and got a 2 wheel drive turbo, so if i need the lamber sencor i would have to drill a hole in my down pipe. Thanks.