thebufenator

iTrader: (2)

Well, the past few days I have had this annoying rattle when driving below 40ish. Seems to come from underneath the car......not sure where.
I thought it was the tranny, but the other day I had a buddy look under the car while I hit the gas ( neutral ), and he said it looks like the cat was vibrating.

I also have an emissions inspection in June. So I cant gut the cat.

Its a 93 Z28, so it only has 1 cat.

I guess buying a hi-flow Magnaflow works, right? What in/out pipe sizes do I need? Any other options?
Exhuast is stock except for a Magnaflow catback. Which has a rusty muffler.

TheTransporter69

iTrader: (5)

your exhasut could just be lose, mine made noise too untill i gotit tightened up.

6spd97ta

iTrader: (2)

it could be the inside of your converter falling apart. i think stock pipe is 2 3/4 but cant remember exactly.

thebufenator

iTrader: (2)

anybody know where the cheapest place to buy a new h-flo cat from is?

That_guy

iTrader: (1)

yea thats it mine is having this problem right now, will it affect my chances of passing the inspection if i leave it alone?

the_merv

iTrader: (88)

HIGH FLOW CAT- Get a straight section of pipe, cut the Cat off and gut it, cut it inhalf, weld the shell to the straight section of pipe. Works everytime for visual

thebufenator

iTrader: (2)

yeah well, I doubt I will pass the sniffer test with that...............