Anyone use open header at the Track

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How the carb is jetted and how restrictive your exhaust and mufflers are will affect the results you get when opening up the exhaust. Doing that "typically" leans things out.
 
I have usually run open headers, unbolt extension and exhaust pipe and bolt them up offset for drag racing. That leaves open header. This weekend for first time at track this year, I took pipes off extension and bolted extensions back onto headers. The car used to run 8.05 and 90 mph. Car picked up 8 mph, ran 99 mph all weekend. ET was 7.95 to 8.05 depending on heat and weather. I did a minor jet change and fresh plugs so I don't know what caused higher speed. Exhaust extensions or tune up?
 
3406pk said:
I have usually run open headers, unbolt extension and exhaust pipe and bolt them up offset for drag racing. That leaves open header. This weekend for first time at track this year, I took pipes off extension and bolted extensions back onto headers. The car used to run 8.05 and 90 mph. Car picked up 8 mph, ran 99 mph all weekend. ET was 7.95 to 8.05 depending on heat and weather. I did a minor jet change and fresh plugs so I don't know what caused higher speed. Exhaust extensions or tune up?
Click to expand...

Tune up I'm sure. I had headers on a 73 Challenger 340 car. Open headers or closed full exhaust it ran 9.75's in the 1/8th with no changes in jetting or timing.
 
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