performance w/ single muffler
Hope I am not too late, or maybe someone else may benefit from this. I used to have the flowmaster kit like yours installed on my '69 Firebird. The car had a 462 w/ .528 lift cam and decent compression. When I bought the system I was told it was good for 400 horse. The kit fits nice and neat under the car, sounds like your typical flowmaster and I was pleased. As far as performance, my car lacked the power I was expecting, so one day I removed the exhaust and ran open headers. WOW, the car came alive and it was like hitting a nitrous button. One more call to tech line and then I was told the exhaust probably starts hurting power at 250 hp level. So if you have a mild engine, the kit is clean and sounds nice. If your looking for true performance, stick with the duals. By the way I went with 3" true duals w/ flowmasters and the car really rocks now.
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