Fabspeed Bypass Pipe-Any Experiences Welcomed.

[The Radium King]

the ebay headers are copies of expensive headers (slightly larger diameter, equal length primaries, etc.) so the the differences between $65 and $1000 headers become very small (ie, porting, polishing - most things you can fix with a dremmel) and any power improvements negligible.

regarding the cats, please show my anything that confirms that the cats on the mid pipes are more restrictive than the cats on the headers. here's a previous post by a board member regarding cell count:


Quote:


"Anybody have any idea how many "cells" are in the OEM primary and secondary cats?

I've come across differing information. In the past, I've been told that the primary cats are 400 cell and the secondaries are 600. However, I tend to think that they're 400 cell all around."

so, either the cats are the same, or the cats on the midpipe (the 600 cell secondaries) are more restrictive. either way, best money and performance are on the ebay headers and leave the midpipes as-is.

[Johnny Danger]

Originally Posted by The Radium King

the ebay headers are copies of expensive headers (slightly larger diameter, equal length primaries, etc.) so the the differences between $65 and $1000 headers become very small (ie, porting, polishing - most things you can fix with a dremmel) and any power improvements negligible.

regarding the cats, please show my anything that confirms that the cats on the mid pipes are more restrictive than the cats on the headers. here's a previous post by a board member regarding cell count:


Quote:


"Anybody have any idea how many "cells" are in the OEM primary and secondary cats?

I've come across differing information. In the past, I've been told that the primary cats are 400 cell and the secondaries are 600. However, I tend to think that they're 400 cell all around."

so, either the cats are the same, or the cats on the midpipe (the 600 cell secondaries) are more restrictive. either way, best money and performance are on the ebay headers and leave the midpipes as-is.

Throughout my entire experience conducting exhaust mods, I've both read and have been told by virtually every knowledgeable exhaust "tech" and "tuner" that the secondary cats on the 986 were 600 cell .

[insite]

There is a lot more to it than that......

Originally Posted by The Radium King

so, either the cats are the same, or the cats on the midpipe (the 600 cell secondaries) are more restrictive. either way, best money and performance are on the ebay headers and leave the midpipes as-is.

[The Radium King]

yup, and a lot of that has to do with tuning the exhaust to maximise exhaust gas scouring at lower rpm, improving low rpm flow efficiency while maintaining backpressure, etc., all of which supports locating the cats further downstream and improving the headers.

ps, the quote about both cats being 400 cell was made by JD in a thread from about a year ago, so caveat emptor to all.

http://986forum.com/forums/showthread.php?t=25644&highlight=600+400+cats

[Johnny Danger]

Originally Posted by The Radium King

yup, and a lot of that has to do with tuning the exhaust to maximise exhaust gas scouring at lower rpm, improving low rpm flow efficiency while maintaining backpressure, etc., all of which supports locating the cats further downstream and improving the headers.

ps, the quote about both cats being 400 cell was made by JD in a thread from about a year ago, so caveat emptor to all.

http://986forum.com/forums/showthread.php?t=25644&highlight=600+400+cats

Since that thread, further research and discussion on the topic lead me to discover that the secondary cats were 600 cell . I've always been someone who strives to enhance his knowledge about things. Particularly, when there seems to be a lack of reliable information . And, by doing so, I am able to better understand what it is that I am dealing with (in this case my vehicle), and hopefully be able to pass on what I have leaned to others .