I have an 84 305, with no mods at all, and just single exhaust. I was thinking of cheap mods for it and thought about gutting the cat. What is the best way to do this? Also, I have two cats on my v-6 parts cars. Could I gut one of them and put it in place of the one I have now, Because I don't want to mess up the only one I have for a v-8. If course that is if they are engine size specific. Also, about how much would this help? And what would be the difference in sound?
Thanks
Evan

 

I just gutted mine today. I dont have it all together yet, but I have a few tips. First, do it outside of your garage because it gets really messy. Wear a breather mask. Im sure breathing in all of that dust cant be good for you.
As for actually doing it, I used a long screwdriver (about 32") and a hammer. It seemed really difficult at first, but once I got going it wasn't too bad. It took about ten minutes all together.
I would imagine that it should breath a lot better now. those things are really restrictive.

 

Make sure to get a piece of piping and slide it through the inside of the cat. Otherwise the turbulance will be so great it will do more harm then good.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

What do you mean about sliding the pipe through the cat?

 

When you gut the cat you go from a relativley smooth flow to a very turbulant(sp?) flow caused by going from a small area to a large open space back down to a small area again. Putting a piece of pipe through the gutted cat restores a smooth flow.

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85T/A 305/QJ work in progress.

 

you might wanna just put a straight pipe in there, i just put one in my 91 RS with a 305 (31,000 miles) and it didnt make it ANY slower at all. It made it a little peppier if you ask me! I think you should at least TRY it before you say it wont help, you'll never know until you try

 

If I wanted to try the pipe, how do i put it on, and then take it off if I don't like it?