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<blockquote data-quote="IrTehL33T@DBeez" data-source="post: 1943284" data-attributes="member: 568276">peak horsepower output has a direct relation to exhaust pipe diameter based on proper exiting velocity from the exhaust ports in the cylinder head, the requirements of diameter to be properly in tune with the engine depends on displacement and compression. high compression and high displacement requires the most free flowing exhaust possible, to maximize the performance by matching the camshaft profiles used with such motors, the which have very high duration, with minimal lift and extreme lobe separation angles.if you have a lower compression engine, what you will be looking for is an exhaust that provides exacting diameters of the primary exhaust tubes (the ones immediately after the cylinder head) and then a varying diameter thereafter to create an increased exhaust velocity while reducing backpressure before the gases exit the tailpipe. one of the biggest things to avoid is the catalytic convertor, all they do is rob performance because the gases that it effects are actually heat extractors which help create a more stabilized exhaust pressure thru the more controlled temperature. this helps provide the lower performance engines to breathe in more of an open, racing exhaust style without being quite as extreme as the full racing exhausts you&#039;ll find on high performance engines.</blockquote>

[QUOTE="IrTehL33T@DBeez, post: 1943284, member: 568276"] peak horsepower output has a direct relation to exhaust pipe diameter based on proper exiting velocity from the exhaust ports in the cylinder head, the requirements of diameter to be properly in tune with the engine depends on displacement and compression. high compression and high displacement requires the most free flowing exhaust possible, to maximize the performance by matching the camshaft profiles used with such motors, the which have very high duration, with minimal lift and extreme lobe separation angles. if you have a lower compression engine, what you will be looking for is an exhaust that provides exacting diameters of the primary exhaust tubes (the ones immediately after the cylinder head) and then a varying diameter thereafter to create an increased exhaust velocity while reducing backpressure before the gases exit the tailpipe. one of the biggest things to avoid is the catalytic convertor, all they do is rob performance because the gases that it effects are actually heat extractors which help create a more stabilized exhaust pressure thru the more controlled temperature. this helps provide the lower performance engines to breathe in more of an open, racing exhaust style without being quite as extreme as the full racing exhausts you'll find on high performance engines. [/QUOTE]

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