i am going to run edelbrock headers , random tech cat and random tech cat back.....what do u guys think the sound is going to sound like...........do u think this is a good set up

 

I dunno about the muffler and headers, but i have a random tech cat and a flowmaster muffer, stock piping size, and it sounds like i have headers I was very impressed with the difference in tone the cat made when i purchased it. Hope this helps.

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1986 WS6-Equipped 5.0 TPI Trans Am
Random Tech High-Flow Cat
Two Chamber Flowmaster Muffler
Megs Custom 4.5" Stainless Steel Rolled Tips
1999 Grand Am GT In-Dash CD Player w/Equalizer(fits like '86 original)
5% Tint On Rear, 35% On Sides
http://www.pitt.edu/~zyhst/trans86/

OTHER RIDE:
1998 C5 6Spd. Corvette Coupe
Silver w/Gray Leather Int.
12/14 Options
Stock(for now)
Best 1/4th: 13.5 @ 104.4MPH

 

Dude my 85 SE has a 6 in it with a random cat and flowmaster catback, it idles almost like my 305 formula.