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I had the opportunity to checkout the stock exhaust system, and it is very nice for factory stock. I wouldn't imagine more than 3-4 hp with just an exhaust only upgrade.

Add an upgraded air intake, change fuel pressure, modified valve timing and ignition timing, and remap the air/fuel tables (ECU reprogram) then you will see a better degree of performance. I was able to tweak 18 more hp out of my Honda B18C1 engine by doing this while maintaining good street manners. Just adding one part is usually not the answer and can actually degrade performance if the computer doesn't accept it properly.
 
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