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Cobra Forums
2013-14 Shelby GT500
Looking for exhaust recommendations.
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<blockquote data-quote="Bad Company" data-source="post: 17011920" data-attributes="member: 141815"><p>Thanks for the vote in confidence in my exhaust extremes. So far I believe it has helped with max Hp at high RPM. The idea was to have as close to as free of an exhaust system that a set of open headers provides, yet retain an exhaust to fool the LEOs while driving by them sedately into thinking the car has a full exhaust system under it. Doing the math to calculate area of the 4" pipe versus the 3" pipe with the dumps open brings the complete area to the tail pipe to almost the same cross sectional area measurement of a 4" exhaust to the rear of the car. Take into the effects of the fact the exhaust gases are losing heat from the collector to the tail pipe and the velocity of the gases should similar to the end of the tail pipes also. I really was striving for the results of a short 18" long 4" pipe after the collectors. It is close with the power numbers climbing all the way to 7700 in the last dyno run with this set up. </p><p></p><p></p><p>Once I have the car back from Texas with the MoTec installation and tuning taking place over the winter I'll get a sound clip of it</p></blockquote><p></p>
[QUOTE="Bad Company, post: 17011920, member: 141815"] Thanks for the vote in confidence in my exhaust extremes. So far I believe it has helped with max Hp at high RPM. The idea was to have as close to as free of an exhaust system that a set of open headers provides, yet retain an exhaust to fool the LEOs while driving by them sedately into thinking the car has a full exhaust system under it. Doing the math to calculate area of the 4" pipe versus the 3" pipe with the dumps open brings the complete area to the tail pipe to almost the same cross sectional area measurement of a 4" exhaust to the rear of the car. Take into the effects of the fact the exhaust gases are losing heat from the collector to the tail pipe and the velocity of the gases should similar to the end of the tail pipes also. I really was striving for the results of a short 18" long 4" pipe after the collectors. It is close with the power numbers climbing all the way to 7700 in the last dyno run with this set up. Once I have the car back from Texas with the MoTec installation and tuning taking place over the winter I'll get a sound clip of it [/QUOTE]
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2013-14 Shelby GT500
Looking for exhaust recommendations.
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