Since fitting the 200cell cats the bloody car is soooo loud. On cold start up its too much, neighbours won't be my best friends. I've put the fuse back in and I'm not sure it's made a difference. How can I check if the valves are working? Can you see them?
Yes you can. I had a similar issue and needed to check their operation. I just set my iPhone to record and placed it under the car. I then revved the car past 3600 to see them operate correctly. This is what you are looking for..
