For my exhaust, I have BBK Longtube headers, a matching BBK short offroad H-pipe, flowmasters on the stock tailpipes. I installed screw caps from a metal 55 gallon drum onto my flows beside the outlet, causing most of the exhaust to dump infront of the axle. I believe Mustangworld.com has the info on how to do it on their tech page. Basically cut the caps out, and weld the female threaded ring onto the back of the muffler after cutting the hole out with a hole saw. When you want it LOUD, unscrew the cap, for quiet running just put the cap in and it would sound like it did before. Be forewarned: It is REALLY LOUD in the car with headers and and o/r h.
Tim C
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