Bad Exhaust Install?

[DC2-PWR]

When cats get to a certain tempreature they will explode, if a less tempreature they will get damaged. (heat makes thing expand)

unless you have a flex pipe right infront of it.

my exhaust speaclist nearly welded my mouth when i said 'just weld the cat to the exhaust'. He said "you don't know how dangerous it is", i forgot what else he told me, he talked for ages.

then a guy off this forum Doug (4shizz) told me the exact same thing, he scared the crap out of me. but he was like "all good, you have a flex pipe right infront of it".


what color was the cat orginally when you bought it? was it silver? or dark bronze like on your picture?

[NightKids]

No it was pure silver. It turned to this colour pretty quickly but I thought it was normal.

Other exhaust places haven't said anything about it so far... do you think there's a problem there?

It originally looks like this...

[DC2-PWR]

No it was pure silver. It turned to this colour pretty quickly but I thought it was normal.

Other exhaust places haven't said anything about it so far... do you think there's a problem there?

It originally looks like this...

if you still have the old flange, go have a good look at it

its not just a flange with bolt mounting stuff around it

it has a pivot that fits onto the cat, made for some odd reason.

tommorow when you get time, call up an exhaust shop, someone who knows there shit. tell them what happens if i weld the cat straight onto the exhaust, without the flange.

i forgot what my dude said but it was important.

but yeah i have a 90% feeling that your cat is damaged now.

[SuperJDM.]

you dont seem to have this extra flange thing @ the front of the cat that connects to the header. the man cut it of my old cat leaving it hanging from the header then welded the cat onto that.

Ill take a picture of it tomorrow if you want. Also my cat still looks silver :S maybe yours is getting too hot?

isnt that his flexi pipe there? that big thing on the right



that

[DC2-PWR]

Yeah but it has to be right infront of the cat, to survive.

the flex pipe will act like the flange's pivot, and the flange is welded directly to the cat.

so thats hows the flex pipe has to be, directly welded to the cat.

[NightKids]

So u guys reckon my cat is gone now because of this? I'll check out the old cat and see what you guys are talking about...

Can u post up a pic of your setup if possible superjdm.

I've checked out some clips of damaged cats on YouTube and it sounds like marbles rattling inside but mine sounds pretty quiet when free revved...

[SuperJDM.]

your cats the same colour as mine now, now im scared too.



red = Cat
blue = that thing i said you dont have @ the end of the cat

[Super-DA9]

hey man seriously if you haven't ruled out the resonator definitely get it checked, my exhaust did the same thing and this was the problem, I know I said it before but it'd really be worth it even if it's fine at least you know it's not it so you can cross it off the list.

good luck man

[bighaks]

get the resonator checked like Super-DA9 said iv see alot of the internal perferated tube collapse causing a zinggy sound at certain rpm.

Your cat is of the Spun range of MANGNAFLOW cats, spun cats are known to have the insides to become loose due to excessive heat! now what mite of happen is your car has run real hot (by the looks of it in the pic) and expanded and didnt retract to its original size. This causes it to vibrate or rattle at certain rpm.

[NightKids]

Just went to Dandy Exhausts today and they reckon it's because the resonator isn't big enough to handle the resonance. They quoted me $120 to put a much larger resonator on which will solve this problem.

How can I check whether my current resonator is ok or not? I mean I can't hear any rattling when it's free revving.

If it's the cat problem you're referring to bights then does that mean my cat is stuffed? I paid quite a lot of money for this thing!

[bighaks]

yes it does mean the cat would be stuffed but there is a quick fix to metalic cats.

[NightKids]

My cat doesn't really make a noise when you hit it though... i'm kinda leaning towards needing a bigger resonator. What do you think?