Im trying to decide which 3" Hi-Flow cat is the best out there and my search didnt come up with the results I wanted. Im looking for something that will last at least two years, fully bolt on with air pump tube already welded on, and I can recive within three weeks. Im also running a pfc which I have read causes the air pump to work differently lowering the life span on a cat.

I was really interested in the smb cats but they are all the way in Aus so I dont think they can get the cat to me in three weeks. Im gonna shot em an email and see what they have to say though.

Thanks guys,
Chris

 

Bonez

 

Yep, you can order one from www.rx7.com or just go pick one up from Rick (Rick's Rotary).

 

Sweeeet, thank you guys sooo much. Its exactly what I was looking for

I will go down to Ricks and pick one up. He built & installed my reman according to the previous owner and im still rocking his plate frame. Hahahaha

 

Save yourself a few bucks. They're all the same.

http://www.rx7store.net/product_p/highflowfd3s.htm

 

yep, I am wanting to get one too. Hey Jason can we get a GB on those?

 

I wouldn't completely agree to that. There are many older posts about some cats failing quicker than others. Here's one:

 

Another vote for Bonez. Mine has been on for more than three years with no problems. Meets all your criteria and with quality material and contruction.

http://www.rx7.com/store/rx7/fdexhaust.html

 

Gotham Racing has an excellent hi-flo cat as well!

http://www.gothamracing.com/catalog/...roducts_id=407

 

If we can get a few people to buy I can do them for $280

Jason

 

that is a great price. I need one bad.

 

I have seen Bonez fail after 2 months along with Pettit's, but have also seen them last over a year. I think part of it depends on how well the car is running.

Jason

 

I will say that I have read of far fewer Bonez cats failing early than anyone else's. I've personally never seen a Bonez cat fail within 4 years, but I have others. I'm sure Bonez doesn't make their own cat, so I'm sure there are a few other products out there using the same type/brand.

 

Is there a variable missing?

For example, a person drives his 7 2000 miles a year and his hi-flo cat is still intact and working without a problem after 4 years. Same hi-flo and another person drives his 7 daily and racks up 20,000 miles a year and has 2 years on his with no problem.

Years of use seems a bit ambiguous. Id be interested to see what kind of typical use (freeway, around town, racing , etc), how many miles driven, and how many years one could expect from the cat.

chuck

 

Well, I had a Bonez cat which was DD for 2 years, and then a Sunday/track car for 2 years (and 1 year of that was without the airpump). When I sold it, it was in fantastic shape.

 

FWIW, my Bonez has at least 35k of street driving w/airpump. I removed it last spring while doing some work. Still appears to be in very good shape.

 

yeah my boy has had the Bonez on his for like two years no problem. Sounds like you can't lose with the Bonez. Food for thought, what about a metallic substrate cat vs. high flow. better or not as good?

 

Those are pretty good testimonials for the Bonez.

I was also wondering how the metallic substrates had been holding up with use on the fd as well as any emissions issues to consider. Another met. sub. feature which was unclear dealt with the cell density of the substrate and the effects on performance, heat retention, and emissions standard minimum requirements.

I followed a couple of differerent met. sub. threads and didnt feel that there was an abundance of conclusive data. It does seem to be the way to go if it can withstand the tests of time while being subjected to the fds hot exhaust, considering its light weight, small size, and higher flow characteristics as compared to a hi-flow cat.

chuck

 

Uh, this may sound dumb, but what qualifies a cat as having failed or not? The criteria I'd imagine is that the catalyst itself stops working (perhaps it breaks up into little bits)... can someone elaborate?

 

Don't forget about N-Tech. I ran this cat for 2+ years at 300+ rwhp and passed emissions for those two years as well. I then ran the cat with no airpump for about year after that with zero problems. This cat was very sturdy all around.

 

Another vote for bonez. I have had mine on my car for over four years and it was used as a daily driver for about half of that time. I have since gone single and it is still holding up well...

 

I got a Bonez in the mail system right now.

Thanks for all the comments!

 

what is the advantage of running a cat w/o the airpump?

 

Not an authority, but as I understand it, either the ceramic honeycomb or beads break down and clog with time, or a badly tuned car (or sometimes one running without an airpump) can produce so much unburned hydrocarbon (usually during warm up) that they can plug up over time. Either way, the exhaust flow is reduced and subsequent power loss.

 

What is the diff in weight between a Bonex and the stock cat?