So I have a log manifold, SR20 t25, and a 3" exhaust w/ cat. Heres the issue:

I picked up my car from the shop and it had a very weird metallic rattle (much like pinging) coming from the exhaust. I pulled over and I noticed the downpipe was glowing for about 4" where it attaches to the turbo. Let me tell you what I have diagnosed so far.

It is not detonation (the sound is localized) to the turbo/DP
The turbo compressor side spins freely with no signs of hitting
My AFR is not off, and neither is my timing.

Has anyone had something like this happen? I want to say it is a clogged cat, however, the cat is fairly new, but it is a cheap one.

 

clogged cat, to thin of tube used for downpipe, extremely high EGT's due to ---- tune

 

+1

 

Tune is fine.. downpipe has been working for quite awhile.. guess clogged cat it is

 

Like this

 

Rofl, no my turbo wasnt glowing Great pic though!

 

Easiest way to check for a clogged cat is to let the car warm up and place your hand behind the exhuast. Clogged cats tend to super-heat the exhaust gas as it passes. Normal exhaust gas temp at the tail pipe shouldn't be to hot, one with a clogged cat will damn near give you a burn.

 

good call... i'll jump on that after work today.

 

what kind of piping was used to make the exhaust?

 

too much powar