Eliminate Secondary Cats!!!! - 986 Forum - The Community for Porsche Boxster & Cayman Owners

nastyboxster · 05-11-2006, 11:39 AM

I did the Borla muffler and then the 2nd Cat bypass. It was pretty loud with the Borla muffler and even louder with then 2nd cat bypass. Definitely added punch especially at higher rpm's. I just dynoed the car and yelled 247.6rwhp with a few other mods (no chip yet) . You can check out my dyno here http://986forum.com/forums/performance-technical-chat/6040-dyno-results-mods-post45989.html#post45989

Have to do emissions test in the next few weeks to renew my insurance. I'm crossing my fingers.

I think eliminating the 2nd cats is a good way to get better sound and add some hp at the same time without spending a lot of $. Takes under 1 hour to install too.

Brucelee · 05-11-2006, 12:52 PM

I would bet my lunch money that here in CA, dropping the cat would make a Box fail smog. And as you may know, that is a capital offense here in LA LA land.

nastyboxster · 05-14-2006, 06:27 AM

Failed my emissions test, so I have to put the cats back and retest. Luckily, it's once every 2 years and it's an easy swap. Be prepare to do this if you are going to install the bypass pipes, but I think it's worth it for a bit more punch and a louder sound.

Brucelee · 05-14-2006, 07:16 AM

Quote:

Originally Posted by nastyboxster

Failed my emissions test, so I have to put the cats back and retest. Luckily, it's once every 2 years and it's an easy swap. Be prepare to do this if you are going to install the bypass pipes, but I think it's worth it for a bit more punch and a louder sound.

The emissions police and greenies are out to get you!!!!!!!!!

Tool Pants · 05-14-2006, 09:11 AM

Quote:

Originally Posted by nastyboxster

Failed my emissions test, so I have to put the cats back and retest. Luckily, it's once every 2 years and it's an easy swap. Be prepare to do this if you are going to install the bypass pipes, but I think it's worth it for a bit more punch and a louder sound.

Did you fail the visual inspection? In California they first inspect your car to make sure all the emission equipment is in place. If it is not in place then you do not even do the actual smog test because you have already failed the visual test.

xclusivecar · 05-14-2006, 10:40 AM

As Tool Pants said...did you fail the visual or the actual emissions test?

nastyboxster · 05-16-2006, 12:26 PM

The actual emissions test. They weren't able to detect the bypass with the visual. I only failed by a very small margin with regards to Nitrogen. Someone told me to put in ethenol mix gas and try again before putting back the cats. It suppose to burn cleaner.

xclusivecar · 05-16-2006, 02:48 PM

I'm not a Cat expert...but isn't it amazing that these companies that sell these bypass pipes will tell you that the secondary cats are there for no good reason...but Porsche had to put them there for some good reason...and they tell you that you will pass emissions...and then you don't pass emissions...

Man...it seems you cannot mess much with this car unless you want a BIG headache. Everything seems like it was meant to be there...except the SNORKEL!!! RIP IT OFF!!