I have the flow master American thunder under the L79 . The only thing I don't like about the exhaust is it had to be cut to exit like Marlins car. Designed really for a camaro but will work on the nova. For me when I back my car out of the garage on a dirt area the dust is real bad because the exhaust points down with a small angle. I may try to modify mine this winter to exit out the side behind the rear tires. I am in the process of going to the stock exhaust manifolds. Do too, way 2 much heat in the engine compartment from the headers. It also looks like the Pypes tail pipes exit farther back and have a different angle which might help on dirt roads. Mine almost goes straight down. You can see it in the video. Click the image for the video.
