Top Speed's Cat Back System Installation

[tommy583]

Is anyone running these mufflers on an older 986 that doesn't have secondary cats?

[jb92563]

Originally Posted by tommy583

Is anyone running these mufflers on an older 986 that doesn't have secondary cats?

If you have a 986 without secondary cats then your Primary sensored cats are not in the header but directly after the header, in the location where us 4 cat folks have the 2ndary unsensored cats.

So if you remove those you will have NO cats at all and that could be a problem because the O2 sensors will have to go elsewhere and you will have the engine light on and will not pass emissions.

[tommy583]

Originally Posted by jb92563

If you have a 986 without secondary cats then your Primary sensored cats are not in the header but directly after the header, in the location where us 4 cat folks have the 2ndary unsensored cats.

So if you remove those you will have NO cats at all and that could be a problem because the O2 sensors will have to go elsewhere and you will have the engine light on and will not pass emissions.

No I didn't mean taking off the cats. More like since I only have the one set of cats, it's kinda like my car already has test pipes. So I was wondering if anybody runs the set up I have. If they do is there a drone like in the four cat systems. Or no drone like the guys saying they run the test pipes.

[tommy583]

Ok I just read my last post again, I'm not sure if I was clear. My question, is anyone running the top speed or similar mufflers on a 98 model year Boxster. Because on this year the car only has one set of cats. So I wouldn't think I need the test pipes to get rid of the drone caused by the second set of cats on later model year cars. The set up on this model year is header, cat, pipe and muffler. Thanks in advance

[Slate 01]

Is the reducer pipe that attaches to the test pipe supposed to just "butt up" against the u-pipe with the original double wide clamp just holding the to pipes together? I'm having a hell of a time getting that connection to work. It seems I will have to cut off an inch or so on both sides to make it work. Something is going on. Help please!

[shadrach74]

Originally Posted by Slate 01

Is the reducer pipe that attaches to the test pipe supposed to just "butt up" against the u-pipe with the original double wide clamp just holding the to pipes together? I'm having a hell of a time getting that connection to work. It seems I will have to cut off an inch or so on both sides to make it work. Something is going on. Help please!

Look at this post. This is the hardware that I used as well based on Bruce's experience it was 2.5 out of 10 in terms of mechanical degrees of difficulty.

http://986forum.com/forums/324664-post15.html

[jb92563]

Originally Posted by Slate 01

Is the reducer pipe that attaches to the test pipe supposed to just "butt up" against the u-pipe with the original double wide clamp just holding the to pipes together? I'm having a hell of a time getting that connection to work. It seems I will have to cut off an inch or so on both sides to make it work. Something is going on. Help please!

Yes the U bend pipe connects to the reducer by butting up and using the original u tube wide clamp.

Be sure to drive the upstream end of the cat delete pipe reducer all the way as it will likely need to be hammered into place.

you should not have to cut it