Big Red Machine Z06

Just a thought, my car, a '02 Z06 w/ tpis headers, fast 78mm intake, x-pipe w/ high flow cats, PRT mufflers & cold air kit.

I tuned and dynoed 392rwhp sae corrected last summer.

A bone stock Z runs right beside me on the highway.:screwy:

Whenever I go for a good spirited run ( ex. a 1/4 mile pass), I hear a tapping jingling noise coming from under the car when I hit any small bumps in the road. This rattling will usually last for about 30 sec. to 1 min. and go away. I have had the car up in the air and checked for anything obviously loose etc.

Now my buddy who owned the car previously , had run for about a year and a half with "experimental tuning" trying to get it dialed in(without a wideband or dyno)

Could this sound be the catalytic converters solidifing when they get hot, and maybe the power loss ???

Last time the x-pipe was off the cats had the full of rocks sound.

Any input is appreciated.. Thank you.

jhug

iTrader: (11)

Slap some new cats on there and if the noise persists then you'll know that's not your problem

staringback05

iTrader: (8)

take a bat to those bitchs lol

taintedmeat

iTrader: (1)

The cats sounded like they had **** moving around when the xpipe was off? They should make zero noise if you shake them.

ShevrolayZ28

iTrader: (4)

My Jeep did that. It rattled like crazy and sounded like the lower end of the motor took a crap. I took the cat off and found that the block of catalyst was loose inside. I ram-rodded that sucker and put it back on hollow.