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Primary Cat-Delete Pipes


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I've seen the postings concering the loss of power when installing the secondary-cat bypass pipes which only remove the secondary cats. I see that GMP sells a SpeedArt Cat-Delete pipe that seems to remvoed the first or possibly both cats. Has anyone heard anything about these? Will they gaini or lose power?

Below is the description that is posted.

This is obviously for off-road use only.

Porsche Cayenne 957 Turbo Cat-Delete Pipes

(SpeedArt PN#: P5720008T)

speedART offers a pair of replacement cat-pipes that eliminate the first of two pairs of catalytic converters. The high-polished, stailess steel speedART cat-deletes bolt to the factory turbos re-using OEM gaskets and hardware. The race inspired, dual-plate flanges are made to withstand even the most extreme heat. These flanges are the most important factor on these pipes because the design favors expansion rigidity preventing warping. The entire pipes seams have been TIG-welded for the highest qualtiy strength and aesthetics. The inner welds have been smoothed not to interfere with turbo exhaust flow. The design of the pipes is a result of a number of tests. The cat bulge in the tube actualy prevents cabin resonance, prevelant in less-complicated straight pipe designs.

Edited by AVIA8R
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I've seen the postings concering the loss of power when installing the secondary-cat bypass pipes which only remove the secondary cats. I see that GMP sells a SpeedArt Cat-Delete pipe that seems to remvoed the first or possibly both cats. Has anyone heard anything about these? Will they gaini or lose power?

Below is the description that is posted.

This is obviously for off-road use only.

Porsche Cayenne 957 Turbo Cat-Delete Pipes

(SpeedArt PN#: P5720008T)

speedART offers a pair of replacement cat-pipes that eliminate the first of two pairs of catalytic converters. The high-polished, stailess steel speedART cat-deletes bolt to the factory turbos re-using OEM gaskets and hardware. The race inspired, dual-plate flanges are made to withstand even the most extreme heat. These flanges are the most important factor on these pipes because the design favors expansion rigidity preventing warping. The entire pipes seams have been TIG-welded for the highest qualtiy strength and aesthetics. The inner welds have been smoothed not to interfere with turbo exhaust flow. The design of the pipes is a result of a number of tests. The cat bulge in the tube actualy prevents cabin resonance, prevelant in less-complicated straight pipe designs.

These appear to replace the first set of cats as opposed the second set - I am guessing an option only for the turbo? Loss of low end torque can definitely occur on n/a motors if to much back pressure is lost but I can't see that being the case with the turbo - it should increase power.

JR

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