When considering headers for an M113K, particularly on an S55, it's crucial to weigh the trade-offs between performance gains and practical considerations like emissions compliance. Headers generally offer a significant power increase compared to stock manifolds, often delivering 20-40 horsepower more, depending on the design and supporting modifications. Long tube headers typically provide more power and better high-end performance, while short tubes may offer slightly less gain but often fit more easily and maintain better low-end torque. In terms of sound, headers will generally increase exhaust volume, though specific loudness varies by design. If emissions testing is a concern, you may need to explore solutions like high-flow cats or aftermarket tuning to pass inspections while enjoying the benefits of headers. Dyno numbers can vary widely, so getting a custom dyno tune after installation is advisable to measure actual gains. Overall, if the power boost is substantial and aligns with your performance goals, investing in headers might be worth it despite the challenges in passing emissions tests. Writing my dissertation felt like an impossible task until I found
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