I am interested in any info on high-flow cats for my Z:

1. What is the best manufacturer?
2. How much do the parts cost?
3. Where do I get them?
4. How many hours to install by competent mechanic?
5. Will it make my tailpipe emissions worse? (worried about smog test)
6. How much hp gain can I expect? I already have Borla true dual exhaust.

 

read this thread for all the answers to your questions

https://my350z.com/forum/showthread....threadid=50255

 

1. I think the RT are the best
2. 500 at performance nissan if you metion my350z member
3. performance nissan
4. about 2 hrs
5. should pass smog (check you country for regulations)
6. 5-10rwhp

and here is a pic of what mine came with.

 

Crawford also makes high flow cats. Not sure of the price. I have the Random cats as well and love them. Shouldn't take more than an hour to install. Jeff at Performance tested and passed emission to the best of my knowledge- but if you're in CA they will not pass visual inspection so you'll need to swap the stock cats at smog time.

 

Richard just buy the Randoms.

 

Do you need a special tool for the sensors or can you install them yourself with the usual tools?

 

i got the crawford cats, and love them, they were 450 + shipping, it takes about 1 hour to install. they sound awsome

 

Ditto on the Crawfords.... Shold go real nice with my upcoming TT setup....


Gurgen

 

Its best to use an O2 wrench so you dont damage the cable attached to the O2 sensor.

Here are gains from the Random Cats that are PROVEN on this dyno.

I had my dyno pull after driving for an hour to get to Powertrain Dynamics. Talked for a while with a guy from down the row of shops. Laughing about things people came in with attached to their car's to try and make power. The funniest thing was a WEED WACKER as a blower!

Any way to the point of this. MY DYNO!

My car was warm from driving for an hour, out side temp was similar to the previous DYNO. On the same DYNO

Previous DYNO 11/01/03 = NISMO Cat Back Exhaust
Latest DYNO 11/18/03 = NISMO Cat Back Exhaust & Random Technology High Flow Cat's

11-01-03 = 241.4 Actual RWHP / 231.3 Actual Torque (ft-lbs)
11-17-03 = 248.0 Actual RWHP / 239.3 Actual Torque (ft-lbs)

Gain = 6.6 RWHP / 8 Torque

I am VERY pleased with the Torque gain down low and how the gain is across the full span of the powerband. I loose TQ and HP on the 6400 mark faster then with only the exhaust. I am hoping an intake of some kind will fix that.

It took me over 3 hours to drive home so I dont exactly feel like bending over my car and putting in the K&N Typhoon.

So! Soon to come, Typhoon Install (tommorow) and Dyno of the Typhoon added to this.

Below is the Pre / Post DYNO sheet and link to a video of the Dyno pull where you can really hear the exhaust in action up to 140+ MPH!

http://members.aol.com/performancenismo/dyno2.avi

 

Jason - I placed my order with you guys yesterday! This will be my first mod after owning over a year! Next will be strait exit injen SES in the spring. I can't wait to see how the typhoon efects the dyno. Thanks!

 

Yes, we have processed your order Thanks!

Im curious to see what the dyno would have done if his fan was on! I think I lost 6RWHP because of that.

Im going to do a pull with the K&N with the fan ON and OFF to see if that would make a difference.

Please let me know how you like the pipes when you get them!

Jason

 

I thought they were CARB exempt. Well, I'll probably look into Crawford's now since they look stock.

 

If you crawl under our car you can barely tell there is or is not a cat there at all.

 

Jason,
Are the RT cats still offered at $500 for my350z.com members?

 

Yes they are,

Jump on it because prices on our web site will be changing soon!

 

Anyone know how to view the clip from Jason using AOL. Won't let me see it with Real Audio Player.

 

open it with window's media player.

right click the link - open with...

 

Exactly the point...

Crawford's LOOK stock. They have already passed the visual here.

There isn't any other replacements out there that will unfortunately. Any polished piping, etc. will give it away... Seriously, have you ever seen a GOOD look cat??? lol

Put me in a sniff free, visual free zone... HAND ME SOME TEST PIPES! Until then... I'll stick with Crawfords!