What downpipe (cat or off road) are you running on your SS/TC?
How much track time do you see and would you recommend your DP.

I am looking for something that can take hard open track duty, catted if I can.


thanks

 

any reason you want to stay catted? i see the cheap cats that are used in the aftermarket downpipes nuking themselves with the type of driving you do

 

Hahn dp is what you want

 

not all aftermarket cats are cheap.

I have the hahn catted downpipe and although its expensive it is very nice piece. I may pick up a catless downpipe, if I do I'll maybe go to zzp for it. But I have zero regret with my hahn catted.

 

I'm on the MPx catted downpipe. I haven't been out to the track since I installed it though.

It should run cooler than the stock cat since it's less restrictive. Also since the GMS1 runs pretty lean, there shouldn't be too much fuel burn on the cats. I prefer to have a cat. I can't stand the way catless cars smell. Fine for track, but sucks when you're on the street.

As far as designs go, I personally don't like the way the O2 tube is done on the ZZP DP. It's a wideband O2, working in closed loop. I want mine in the airstream if possible. I'm sure folks will disagree with me, but that's my opinion.

 

LOLWUT?

That's the second o2 sensor...it's there primarily to see if the cat is there or not...the lambda sensor is in the turbo manifold...

 

well the front is on the 02 housing. that is the wideband. the rear o2 is angled so it wont throw off the cat code

 

Zzp catless dp, 30k miles of abuse and its still in good shape

 

I like mine.

Fits well.

OP, if you're going catless...just get whatever stainless one is cheapest.

At the time ZZP's happened to be, that's why I have theirs.

It is a nice piece...fits better than the synapse one I had....but synapse was the first.

 

I have to claim extra "PIPS" to run an offroad setup, not sure if it will be worth the penalty... still looking into that. Right now I am maxed out in GT1.


Is it this one?
http://www.modernperformance.com/dow...bo-p-2022.html

Is that a spun metal cat? Ceramic is a big no no for us track boys.

I am trying to stay in GT1
You are right, i've seen ceramic ones just melted to **** after one day on the track.

I wonder how is the ZZP spun metal cat setup?

 

The MPx and ZZP are both spun metal cats. Pretty much any cat that is small and cylindrical is spun metal. The ceramic bricks are much larger. I've run ceramic cats on track before (pretty much what all cars had not that long ago) and they never fell apart on me. The only time I think it causes a problem is when you run really rich, so the cat basically burns up.

I thought the rear O2 sensor also calculated into the closed loop operation of the car. If not, then I'm wrong, and it doesn't matter if you have the long tube, but ZZP admitted that even their long tube O2 can throw a code during cruising, because there isn't enough air going over it.

 

Make sence. We had to run 10.8 - 11.1 A/F on my Cobra to keep her stable and had to go offroad, the ceramic cats did not last very long.
Never tried the spun metal stuff though - still learning.

The ZZP setup has the cat down low and MPx is up higher... which is better?

 

That's another reason I ditched the zzp when I got it. Closer is more efficient for emissions, though shorter lived. Should be fine given that we're not running pig rich, and easier on the lungs if you daily drive it.

 

I've had a good experience with my CIA (ClearImage Automotive) catted one. Not sure what the cat is made of though.

Just thought about this, but why not try out the Hahn mod pipe? Then you can be easily catless at the track and catted for DD or when you want to have the cat at the track. http://www.turbosystem.com/ProjectVe...%20MODpipe.htm

 

That make sense, so for longevity I think I am going to look into ZZP...