Aftermarket Catalytic Cnvt hurt resale???

[EttevroC]

Well I got my vette back from the shop and here is the current low down...

1. The exhaust has a much deeper and louder sound to it. It now has a distinct "thump thump thump" sound to it where as it was more like a muffled moan with the old cats.

My wife was following me back home in our PT and she also said that it sounded much louder to her as well.

I'll let you all know if there is any resonance problems later on.

2. The Interior definitely feels warmer, but not localized at my feet like it used to, unfortunately there was no additional heat shields that came with this Cat. :eyerole

3. They put in injector cleaner in the fuel tank which made it the car hard to start and had a erratic idle, but it cleared up once the car warmed up.

4. The MPG is back up to 25, maybe more... I took the back way home and not the highway.

The old cats are safely in my barn waiting for me to put them into anti-rust protectorant.

 

[EttevroC]

Well the test is in and there isn't any resonance that I can tell, just louder exhaust sound.

The idle is more smooth but still runs about 900 rpm, a little high. Will less restrictive exhaust cause the idle to run high?

Thanks for everyone's input!