Here they are. Part of the first litter of stainless steel hi-flow cat replacements. The set cost $475 and will bolt up to stock and most aftermarket header / exhaust setups. Estimated hp gain between 3-5 hp (dynoed).

Crawford Z Car

 

Another . . .

 

Don't people usually give kittens away? I mean it looks like you have a bunch of them hanging around your place you probably just want to get rid of.

They do look nice, but too much for me.

 

I think that is a great price for HF cats! I am currently deciding between these and the random techs, which are $650 for the pair (:

 

Since we have 4 cats, this item removes one of them each and replaces the other, correct???

Also, man, it is hard to make power out of this car. 3-5 HP is nothing to get excited about, I assume with other mods, this would increase, but how much, noone knows. They do look nice though, and since it is Crawford, I know they work.

Doug, how about those headers???

 

Yes in stock form each side has a pair of cats. One before and one after the O2 sensor. This system replaces these two stock cat with one hi-flow cat before the O2 sensor. It frees flow 2 ways, elimiation of 2nd cat and also using a hi-flow cat for the first. In most cases this replacement will pass visual inspection and computer tests. Definitly more legal than no cats!

3-5 HP is not much but every little bit helps, plus it helps flow. Oh I think it drops some lbs too, I will weigh tomorrow.

Headers are still going, just slow.

 

Doug,

Looks good, I definetly would like to pick up a set of these for the 350 project car. The test pipes that I have heard and seen, seem to have a less clean sound to them almost like a gurgle.

Glad to see they are out! Can't wait for the headers too hurry up!

zya
Yuichi

 

More like less illegal.

(But illegal none the less.)

 

On a side note...this statement is probably on the minds of many people of this forum and is a testament to the hard work of Doug and his quality products. I'm saying this and I don't even have any of Doug's products (my first mod will be a Twin Turbo set-up ). By the way that pic of the "Kittens For Sale"

 

Sorry, that's not very clear. Is the 3 - 5 gain estimated or dynoed?

 

Not sure what the law is in other states, but in California I *believe* it goes like this: you cannot replace emissions regulation devices unless they have failed, and then you can only replace them with CARB approved items. That being the case, I'm guessing it would be legal to replace your cats if your old ones broke, failed, etc.

I mean heck, at some point it's possible for your cats to legitimately go bad, get fouled up for some reason, etc. At that point you *have* to be able to replace them as needed. It's my understanding that most low-flow cats are that way simply because they are cheaply made... and that's why manufacturers use them: to cut costs. A high-flow cat, though, is still a cat and still does the job of a cat, I'm guessing it just uses more expensive materials or a more expensive process to make it more efficient and higher flowing.

Crawford guys, would these cats themselves happen to meet CARB regulations? So if our oem cats were to legitimately fail, would these cats be legal replacements? Is there even such a standard for cats? (Such as the cat being able to convert at least X parts-per-million of some gas per Y volume of exhaust... or some such formula.)

 

I have a question, from an FI standpoint, I assume this is good for an SC. But in a turbo setup, some people like to run bigger diameters and such for as free of flow as possible. Looking at most engine mods out there, it seems that few are for a turbo setup. IF this mod can fit some bigger diameters for a turbo exhaust, wouldn't this mod be ideal for a turbo???

 

High-flow cats help out just about *any* type of setup whether it be NA, turbo, or SC. With my Audi's 1.8t engine, for example, installing a high-flow cat makes a very big difference, notably in improved spool-up speed. The big turbo upgrade kits for my engine often include a high-flow cat... at least as an option. I would guess that any of the 350Z's turbo kits will show noticeable improvements with a high-flow cat upgrade.

 

It has been done, but not correctly (in the eyes of those nit pickers here), so thats why I stated it the way I did. We will not post dyno until it is done in a manor as to not bring false suspicions. We will re-dyno on my car with before and after dyno runs on the same day only changing the cats.

 

OK, thanks for clearing that up.

 

Yep same here (I think). You are not supposed to replace them unless they are damaged or defective.

So as you remove the old ones and it happens to drop and dent or you happen to "bottom out" and scrape them up its best you go ahead and replace them because they are now damaged!

 

If that is not a sales pitch what is?!?!?

At least you're more creative than me... why don't we switch jobs for a day? You sell and I program?

 

As for Ohio, you cannot touch the cats unless one of two requirements is hit:

1. You have more than 50,000 miles
2. The cats are damaged to the point where they do not function correcly from an emissions standpoint (scrapes don't count).

However, this only governs shop installs. You can do what ever you want, but it would still be illegal. However, no one is going to catch you. The trooper is not going to look under your car. If you live in a county that does emissions inspections (Cuyahoga), you will not have to worry about it until 5 years have passed. And even then, the cats will scrub enough of your emissions that you will pass the test. But, this is just Ohio.

 

This is what has me thinking that the high flow cats would actually be best for a turbo setup. Sure, it is good for all and will make some power, but in a turbo setup, you are looking for as much flow as possible. With a turbo setup, I bet the high flow cats would make a lot more power, of course, can't be sure til it is done!!!

 

It's my understanding that high flow cats help only if their CFM rating is greater than the stock units.

What's the stock cats CFM rating?

What's the CFM rating of the Crawford cats and the Random Tech cats?

Many of us would like to know the CFM rating and HP - Torque numbers before forking out the bucks.