I have stock headers and a prochamber on my 90 LX 5.0 and, of course, 2 chamber flows...cut the tail pipes off to get new ones welded on and haven't gotten them welded on in over a month or two I'd say, so it jus cuts off after the mufflers. It's loud...sounds pretty good, but kinda does get annoying. It makes the stereo kidna hard to hear...I normally had mine on 55-58 before, and now I catch myself turning it up to 65-69 just to decently hear it when going down the highway.
When I drive it, I set off car alarms every day in the parking lot at school. Last week, I drove in and within 30 sec, I had set off two car alarms because of the loudness vibrates the ground and/or cars and triggers the shock sensor...just beeps a few times, not a full alarm.
If you live in a residential area, your neighbors will hate you, especially if drive the car during normal sleeping hours.
Basically, sounds cool and is fun for a little bit, but I'm anxious to get my tailpipes put back on.
To each his own though