another happy ebay muffler customer

[jb92563]

The way to eliminate the drone is to get the 2ndary cat bypass as well from top speed and then you will realize the full benefit without the drone.

however thats only possible if you have 4 cats total, 2 in the headers with all the o2 sensors and the 2nd cats with NO sensors.

removing the 2nd non sensored cats makes a big difference in throttle response with my 01 S with egas. The throttle response is awesome now and the sound is pure sports car music.

[JBoe]

Originally Posted by jb92563

The way to eliminate the drone is to get the 2ndary cat bypass as well from top speed and then you will realize the full benefit without the drone.

however thats only possible if you have 4 cats total, 2 in the headers with all the o2 sensors and the 2nd cats with NO sensors.

removing the 2nd non sensored cats makes a big difference in throttle response with my 01 S with egas. The throttle response is awesome now and the sound is pure sports car music.

My test pipes are ordered and I'm anxiously awaiting them. I've read this info before and that's why I decided to order both from Top Speed. Good guys thus far and I even ended up getting the front strut bar from them also.

[jimmythemufflers]

Originally Posted by jb92563

The way to eliminate the drone is to get the 2ndary cat bypass as well from top speed and then you will realize the full benefit without the drone.

however thats only possible if you have 4 cats total, 2 in the headers with all the o2 sensors and the 2nd cats with NO sensors.

removing the 2nd non sensored cats makes a big difference in throttle response with my 01 S with egas. The throttle response is awesome now and the sound is pure sports car music.

Ill have to climb back under the car and check. Do you bypass the cats on the headers or the ones right behind the mufflers? The only after market headers ive found all have no cats, but a hole for an o2 sensor.

I only meantion the drone as an informational tid bit in case anybody is interested in the same muffler. I barely notice it.

[BruceH]

Originally Posted by jimmythemufflers

Ill have to climb back under the car and check. Do you bypass the cats on the headers or the ones right behind the mufflers? The only after market headers ive found all have no cats, but a hole for an o2 sensor.

I only meantion the drone as an informational tid bit in case anybody is interested in the same muffler. I barely notice it.

The cats on the headers have the O2 sensors. You are getting rid of the secondary cats which do not have sensors. Here is a link to Top Speed's cat bypass pipes:

Porsche 986 Boxster 2.7L & 3.2L Including Boxster S 2000-2004 50mm Bolt-on Cats Test Pipes

[Carlisabadman986]

Originally Posted by BruceH

The cats on the headers have the O2 sensors. You are getting rid of the secondary cats which do not have sensors. Here is a link to Top Speed's cat bypass pipes:

Porsche 986 Boxster 2.7L & 3.2L Including Boxster S 2000-2004 50mm Bolt-on Cats Test Pipes

The website does say "will not pass emissions" but everything I've read here insists as long as you don't mess with the first set of cats you are fine (which makes sense given the location of the O2 sensors). For around $500 the pipes and the muffler seem like a great deal and an excellent way to beef up the otherwise tame sound, also $1000 less than the Fabspeed system.