I noticed a rattling noise earlier this week and narrowed it down to happening when the truck was idling in gear. Today when I got home from a 200 mile road trip the rattle was ever-present but much worse.

I jacked the truck up and had my wife start it. I was directly underneath the passenger side convertor and it was rat, rat, rat ratttling so that's the culprit.

These are Dynatech long tubes and no pre-cats and they were purchased from Razor's Edge. Here's a link to the ones for the Lightning. My invoice has the same part#, however. The site doesn't have a link to the HD ones for some reason.

http://www.razorsedgemotorsports.com...roducts_id=214

Question is.....is it common for a high flow cat to malfunction?.......They were installed in July, '03.

Also, is it ok to drive until I can get it fixed?

I'll get in touch with REM and ask about a warranty. ha ha.

Thanks...

 

The cats and headers for a Lightning are the same as the HD's
You will be fine driving around with it the way it is. I had the same thing happen to my Magnaflow cats. Eventually it stoped making noises, but by then the cat was just a empty shell.

You won't hurt anything driving around like that, it is just annoying.

 

Thanks, Don. I'll get it replaced eventually but it still kinda sucks that a system that's less than two years old is malfunctioning like this.

 

I called Razor's Edge and they need to call Dynatech on Monday to see what the warranty is.

Thanks..

 

I just noticed the same sound. I haven't had a chance to investigate, but most likely its doing the same thing as yours. I also have dynatech's from REM.

 

How old are they? I'll let you know what I find out on Monday. Maybe we have a trend here.......

 

I bought them USED from rem in July of last year. I think they told me they were on a customers truck for a few months before I bought them. So they shouldn't be more than a year old.

 

If you don't mind, what's your engine setup? I'm trying to gauge whether temps have anything to do with this. I typically see 1240 - 1260 on my EGT when cruising and 800 - 1100 around town. The truck is putting about 500/625 to the wheels with my current pulley/tune setup.

Thanks..

 

Pre-Headers I had ~420RWHP. I don't have a EGT, so I don't have temp readings. I only have a 4# and a Apten. I have only been to the track 3-4 times since I put the headers on. I don't think I have ran any race gas at all since I put the headers on. I will look at the truck some time this week to see if it is auctually the cat that is rattling.

 

Thanks. Hopefully it's just a heat shield or something simple like that.....

Dan

 

Dan-what other mods do you have done to get your HD in the 500 hp range?

 

Oh...it's got a built short block, KB and all of the other good stuff. Previous owner did all the work. It put down 525/634 on one of Sal's mild race tunes and some good gas. It's toned down for daily driving now but I have two other uppers and two race programs if I want to turn up the boost and get a little more aggressive.

 

Very nice.Just curious did you remove the grill or did the previous owner?

 

Only thing I've done so far is put some new tires on it and some Zaino. Oh yeah..and a new S&B filter.

 

can't tell from the pic,but is there a black grill or was the stock grill just removed?