theBLUEone

I ordered the down pipe as well but w/out the cat... It may sound nasty but I have some plans.....

Xenozx

well i got back from my second place who told me the sound is normal on a new cat. Said that it needs to build up some carbon and they said there is no leakes, and my exaust system install is one of the cleanest they have seen in a long time.

I will give it about 1000 miles see if it gets better, if not he said it could be a bad cat, and then I will look to ZZP for a replacement. I will give it the time to get some carbon built though.

num482

Our you talking the pitch of the exhaust is different at the tip? A high flow cat will give a different tone.

JCswoosher2

So let me get this straight. I could buy this downpipe now and it will fit on my stock exhaust? then if i decide to upgrade to a 3' exhaust it will still fit? please help with my question./

Xenozx

Just as an update. I took my car to 2 different shops. Both say that my exaust system is 100% leak free. I still have that noise from after adding the downpipe. The good news is its not as noticable as it was when I first got it. This makes me believe the statement it will get better once the carbon builds up on it is true.

My bro bought one too, and he gets the same exact noise.


This narrows it down to being the Cat 100%. I have only put 100-200 miles on it since I installed it so it may still get better I will update in a week or two and let you know where we stand.


As far as the HP, I didnt see any difference to be honest. It sounds a bit throatier. I have an aeroforce interceptor and it peaked at 303 hp before the new cat/downpipe. Well low and behold it still peaks at 303. So I dont believe it to have done a thing. Now the scan gauge may be inaccurate, but thats what I saw so take it for what its worth.

05_Blue_B10WN_SS

I ordered my downpipe w/o a cat and it will be here tomarrow. So with my header, downpipe, and 2.5" catback it will sounds prett good (I'm hoping) I'll let you all know how it goes wafter installation.

I know it will throw a CEL, but i beleive Intense can disable the #2 o2 sensor since its usless in the first place (as far as fuel trimming goes)

Nuclear

I'm getting the same noise, i hope it goes away

05_Blue_B10WN_SS

What noise are you guys getting? Is it a high pitched sounds only when accelerating? I installed my Downpipe W/out CAT today, took it for a quick spin. Idle it sounds great, but when ya give it some throttle this high pitch kinda raspy sound occurs. All my gaskets are good and i know for sure everything it tight.

Xenozx

same sound. Sounds like a leak/whistle. I took my car to 2 exaust shops who both said my exaust system was tight as humanly possible. even checked it myself.

Ive put a couple 100 miles on my car and can verify it has gotten better but not perfect yet. Under full throttle you dont hear it, just cruising you dont hear it, it is usually only there from 3-4 k rpms.

eastcoastz

What else do you have done to you exhaust systems? With a catless downpipe this big you have to have a big resonator and a GOOD muffler or it will sound like ****.

jaslowyota

hmmm.. i was about to order the 3" downpipe with the cat but i wasnt expecting it change the sound I think i'll hold off for now, and plus you said you couldnt notice any differnce. Does it sound ricey? And if i ordered the 3" down pipe would the flanges on my 2.5" catback exhaust match up?

Nuclear

At idle the car sounds good and same with cruising its when you acclerate and it sounds reallt fuzzy

jaslowyota

But you couldnt notice any power increase, correct?

Nuclear

i did notice a increase, mostly high rpm's

Nuclear

well just got back from an exhaust shop an theres no leaks, they guys said that the noise was normal with stainless and it should go away after a week or two of driving and if it doesn't they said the cat is no good

05_Blue_B10WN_SS

Mines also leak free. I got mine w/out cat, and it still makes the noise. I got about 150-200 miles on it so far.

Nuclear

[QUOTE=05_Blue_B10WN_SS]Mines also leak free. I got mine w/out cat, and it still makes the noise. I got about 150-200 miles on it so far.[/QUOT

Is the noise getting softer yet on yours?

05_Blue_B10WN_SS

Yeah, its getting a little softer. It creamed really loud like a whistle when i first put it on. I hope it gets better. It sounds awsome w/ my header & magnaflow catback. I just need that freakin high pitch whisle sounds to go away.

ENUFPWR

I have the same noise....leaking sound, but system checks out to be leak free. The noise we narrowed down to being the FLEX part of the down pipe. I have the 3 inch downpipe without a cat and still get that noise. Sounds like a ticking whistling leak.

The flex joint when vibrating is making that noise. I replaced my pipe with my stock one and the sound went away. I pressure tested the ZZP pipe without cat and showed no leaks.

Hope that helps you guys out, I personally don't like the sound, but once my supercharger whine kicks in the sound is drowned out. I only get this with light acceleration in 1000-2500 rpm range.

Xenozx

I feel ya, Mine is actually almost un-noticable now. It just needs to build some carbon up. I can still hear it slightly but only between 3000-4000 RPMS. When lower then that its silent and above that it seems to go away, or the SC is drowing it out, but its really not bad any more, atleast compared to the day of install where I was actually pisseda about it.

Nuclear

Sweet, I hope mine starts to go away soon. I've only put 150KM since the install

jaslowyota

Now that the sound is starting to go away does it sound meaner at all now versus before it?

Nuclear

Mines louder at idle but i'll have to wait for the noise to go away for wide open throttle

Xenozx

Yea, to be honest my exaust was always wayyy too quiet. It really sounds good now. I can atleast hear it when the supercharger is whining its ass off now, where before all your heard was SC lol.

Nuclear

How many miles have you put on since the install? and any pics of the new pulley?