JEBSR5

Maybe a newbie question, but why would the exhaust from plugs to front of cat be white, grey and black sooty cat back with stock exhuast? Need some suggestions for replacement exhaust also. Thinking about a low cost dynomax performance replacement. Any suggestions on this? Why do most recommend replace cat after 100k, mine still smells like it's working, smells like it should, not like raw gas on non cat cars and recommendations if need to replace on low cost free flow cats? Searched high and low in my area and haven't found anything yet, except some that can make a system, not sure about tuning value of these.

Elton

im sorry i cant read your writeing

ChickenLover

Couldn't make any sense of it either.

Saint_Berzerker

wow....hard to understand but I'll try to help

An easy way to test a Cat is to just bang it with something from the bottom and listen for a "rattling" sound. If you hear rattling or stuff shaking in there, it's toast.

V_Runner

check out summit(just google it)...give them a call and they'll hook you up...i just got from them; a dynomax cat,intermediate pipe,dynomax muffler, and tailpipe,...all direct fit and shipped for only $195...thats a steal...

JEBSR5

Thanks, I'll give them a call.

Elton

thats not a bad price i payed a little over 90 bucks for my stainless flowmaster with all new pipe it cost me $170 installed it would of been alot cheaper if i went with a diffrent muffler

JEBSR5

Looked on their web and doesn't list full system for my rig.

Correction: Shows dynomax at 2" without intermediate pipe for $97 and a full catback 2.25" from Jardine for $267. Shows exit at rear, but would rather have it same place on side. I think having on side gives a little scavenging effect.

JEBSR5

Let's see if I can explain better. Recently did some exhaust repairs, O2 sensor replacement and spark plugs changed.

Noticed plugs were white or grey in color. Same color at O2 sensor. After the Cat all the way to the tail pipe end is pure black. Curious as to why it burns so clean until it hits the cat and turns black all the way to tailpipe. You would think it would be grey all the way back.

Other part is a recommended exhaust system replacement, low cost.

Also curious as to why some say to replace cat after 100k, Have never heard of them wearing out. Replacement may be necessary if clogged, but that's the only reason I could think of why you would replace. I'm all for a free flow cat, but I thought all of them were not very restrictive in the first place.

I have found a local muffler shop willing to make a cat back system for me and was questioning the results. It certainly couldn't be a very well tuned exhaust system, cheap though if sound is all you care about.

Elton

get a magnaflow cat off ebay i think there $68 shipped and get a 2.25'' catback muffler is up to you ...do you want it loud?

JEBSR5

Don't want loud. Using a scale of loud and quiet, would want in the middle.

Elton

i would go with a 18'' magnaflow muffler

regularguy412

Cats clog up, over time. The idea is that they get hot enough to get the bad emissions to create a chemical reaciton inside the cat, which changes them into less harmful emissions. The residue left over from the chemical reaction inside the cat and pipe, coat the linings. That's why they need to be replaced when they hit high mileage.

Mike in AR