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I have a performance exhaust that I’ve built, all the way back to the header. It took a couple revisions but I’ve got it sounding like I want. The drawback back is its little on the loud side then the car is started in the morning and driving slow in parking lots or the drive thru. Basically times when you’re cruising easy.
I know more expensive cars try to handle this with some kind of active exhaust. Did a little reading on online and bought some used parts on ebay and came up with this:
The actuator works on intake manifold vacuum and an internal spring. The valve opens by the spring when there is no vacuum. Start the engine at idle, vacuum is high so the valve will close part way to a preset stop. Mash on the gas vacuum gets low, valve opens all the way again. Well at least that’s the idea. Haven’t run it on the car yet plan on cutting it in the exhaust next week. Some of the parts actually came off an old corvette.
I know more expensive cars try to handle this with some kind of active exhaust. Did a little reading on online and bought some used parts on ebay and came up with this:


The actuator works on intake manifold vacuum and an internal spring. The valve opens by the spring when there is no vacuum. Start the engine at idle, vacuum is high so the valve will close part way to a preset stop. Mash on the gas vacuum gets low, valve opens all the way again. Well at least that’s the idea. Haven’t run it on the car yet plan on cutting it in the exhaust next week. Some of the parts actually came off an old corvette.