best way to remove cats?

[djomlas]

you make a good point,
i have my OBD reader plugged in at all times, so pushing the "read" button every now and then should not be that hard.

also, if i do put the test pipes on there, can i just plug the O2 sensor in there? or does that not even matter now that the cats are gone and that the reading off of them will be wrong?
just triyng to understand all this...

DJ

[chaudanova]

Hey DJ, check out this thread that MTS just made:

http://986forum.com/forums/showthread.php?t=18467

The notable part was:

"I did with and without dyno runs with the Fabspeed 2nd cat bypass pipes. The car is a 2004 Boxster S Special Edition with 17k miles (de-snorkled). The baseline runs showed 228 whp. With the bypass pipes installed, the dyno showed 237 whp with a negligible/no change in hp curve. Given all the slight variations run to run, etc, I'd say the Fabspeed claim of 8 hp for using the pipes appears to be accurate, at least on my car."

He gained 9whp on the dyno... not too shabby!

[Allen K. Littlefield]

Do you know if the Fabspeed bypass pipes have a bung for the second oxy sensor?

AKL

[boxster_s_boy_34]

From everything that I can remember both bungs are in the header, so swapping mid pipes is no biggie. The only issues are going to high flow cats in the header with no cats in the mid-pipe ( for analy retentive smog states) and/or no cats at all.

[Allen K. Littlefield]

Originally Posted by boxster_s_boy_34

From everything that I can remember both bungs are in the header, so swapping mid pipes is no biggie. The only issues are going to high flow cats in the header with no cats in the mid-pipe ( for analy retentive smog states) and/or no cats at all.

You are right, I checked it out with Fabspeed and since all the OBD readings are done off the primary cat (fore & aft), you will get no CEL with the bypass, lose about 25 lbs in the right place and sound a bit louder. Claim is anywhere from 7 to 9hp increase. At what speed I don't know but a bit more sound and less weight would do it for me.

How many other mfgs. are making these bypass pipes and at what price?

AKL

[chaudanova]

Anyone want to grab a set of Stebro bypass pipes? PM me...

[boxster_s_boy_34]

Another thing that you can also do is put a spark plug defouler in around your second O2 sensor and then you may be able to go completely catless w/o a CEL