HEADERS & DOWNPIPE UPGRADES

HEADER & DOWNPIPE FAQS

• What's the difference between headers and a stock exhaust manifold?

  A factory exhaust manifold is typically cast iron, with a design that prioritizes packaging and cost over flow. The cylinders often merge at sharp angles that create turbulence and restriction. Performance headers use mandrel-bent steel tubing in configurations specifically designed to let exhaust gases exit the cylinders more efficiently and merge without fighting each other. The result is less restriction, better scavenging, and improved power across the RPM range.

• How much power do headers actually add?

  On naturally aspirated engines, headers typically add 10-20 horsepower depending on the engine and the quality of the header design. The gains are more noticeable in the mid to upper RPM range. On turbocharged engines, a downpipe upgrade can add significantly more because reducing backpressure on the turbo affects boost efficiency across a broader RPM range. Pairing headers or a downpipe with a cat-back system typically produces more total gain than either modification alone.

• What's a catted vs. catless downpipe?

  A catted downpipe includes a high-flow catalytic converter in the downpipe itself. A catless downpipe removes the catalytic converter entirely. Catless downpipes flow more freely and produce more power, but they will trigger a check engine light and fail emissions testing where applicable. For vehicles used primarily on the street, a high-flow catted downpipe provides meaningful flow improvement while maintaining emissions compliance. For track-only vehicles, catless is the more common choice. We'll walk you through the tradeoffs for your specific use case.

• Are headers and downpipes street legal?

  It depends on the specific product and your location. Headers that replace the factory manifold but retain the catalytic converter are generally street legal. Catless downpipes are not emissions compliant and will trigger a check engine light. Ohio doesn't require periodic emissions testing for most vehicles, but federal law still applies. We carry both catted and catless options and will tell you clearly what the legal implications are for each choice before any work is scheduled.

• Do headers and downpipes require a tune?

  On some vehicles, particularly turbocharged engines with engine management systems that are sensitive to exhaust changes, a tune is recommended after installing a downpipe to take full advantage of the modification and prevent the ECU from pulling timing or boost in response to changed exhaust parameters. On naturally aspirated vehicles with headers, a tune is less often required but can help maximize the gains. We'll tell you honestly whether your specific vehicle and modification warrants a tune before you commit to the install.