I put a Flowmaster 80 series muffler on my car last december..a nicer sound than stock, but would I get even more of a sound if I had the American Thunder system put on it? (I am also planning on ordering headers shortly, so it will be quite loud eventually)

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305IrocZ28- Al
1990 Iroc-z 305 TPI auto, Flowmaster exhaust, 2 Rockford 10'' Punch woofers w/ 160a2 amp, 2.73 rear (1650 rpms @ 60mph)

 

Cant really answer your question. But my car has the 80 series muffler on it and I LOVE the sound!

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1988 Jet Black IROC
5.7L W/ 64000 miles
Flowmaster Exhaust
Fully Loaded
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My IROC

[This message has been edited by IROCThe5.7L (edited August 13, 2001).]

 

the 3" pipes will add a louder sound(or should). plus, the way I see it at least, a muffler can make your car louder, but the cat back system will free up power that was bound up by the restrictive factory pipes.

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'86 IROC 5-speed
305 LG4
edelbrock performer rpm intake
edelbrock 600 cfm carb
msd pro billet hei
'95 3.23 rearend
hotchkis rear suspension