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Join Date: Dec 2008
Location: TEXAS
Posts: 172
removing the cat (temporarily of course)

does this really improve HP and performance at all rpms, or just high end? is there a performance decrease initially at low rpms?
heard conflicting things

Anyone have a bypass setup for sale?
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- 1988 Porsche 944 Turbo S Silver Rose
- 1983 Porsche 944 V8 with SBC 350 (400hp dyno)
- 1988 BMW M5

Last edited by ohio_porsche; 03-20-2009 at 06:48 PM..
Old 03-20-2009, 02:36 PM
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removal of the cat removes the restriction in the exhaust system, allowing the exhaust system to breath more.

removal of the restriction in the exhaust system increases the flow capacity of the exhaust system.

the increase of flow capacity decreases the exhaust gas velocity.

the decrease in exhaust gas velocity reduces the scavenger effect in the cylinder.



that's the list of cause and effects. only dyno numbers will show which cause and which effect overpower which.
Old 03-20-2009, 03:02 PM
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dude this is a for sale forum not a tech section
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2000 Audi A6 4.2 - Current DD
1991 944 S2 - sold
1986 951 - departed
1988 924S - departed
1980 928S - sold
Old 03-20-2009, 05:59 PM
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