What's the loudest and best sounding crossflow Flowmaster. What are the inlet and outlet sizes? I'm looking for a loud but good sounding muffler to put on my 89 iroc, preferably with no cat.

 

The 80 series is a loud muffler, but without a cat is gives a tinny hollow sound as well. You can get it with either a 3"inlet or 2.5" inlet and dual 2.5" outlets. It is a good muffler, I noticed a large performance gain when I put it on, however, I dont have a cat either and because of that the sound at certain rpm's can be awful. Just my $0.2 worth!

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Veiw MY CAR at:
http://www.members.tripod.com/~btessier

88 GTA
L98 350
700R4
3:27 axle
MODS,
Edelbrock TES headers, 2.5" straight pipe, Flowmaster 80 series, K&N filter, Accel 8.8mm wires, Bosch Platinum plugs, Wells cap and rotor button, Wells ignition module, MAF screens removed, Hypertech TB air foil, Thermomaster stage II chip, 180* Powerstat, Hypertech cool fan switch, B&M shift kit, B&M power clutch pack, B&M servo, GM fuel filter.

 

I like the Flowmaster 80 Series muffler. Inlet is 3" and outlet is dual 2.5" I have a 3" custom exaust without my cat and Edelbrock TES Headers (coated) I love my setup. Sounds great and performs awesome. Call summit about a good flowmaster cat-back. Make sure its a 3" too and get the 80 series muffler and some nice weld-in chrome tips. And yank that cat completly when u put the exaust on and put a straight 3" stainless steel pipe in its place. Thats what I did. Take a look. http://members.aol.com/j007golden/mod11.html


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Eric Natzke
91 Firebird 305 TBI (ZZ5 summer of "01")
ASCD Ram Air Hood-3" custom exaust-Flowmaster 80 Series-No Cat-Edelbrock TES Headers (coated)-March Pulleys-TBI Spacer-K&N Open ELement-TransGo Shift Kit-B&M Supercooler 28,000 GVW-Hypertech Thermomaster-160 Stat-3:42 GM Gears-Auburn Posi Unit-Edlebrock Strut Tower Brace-MSD Superconducters-MSD Cap & Rotor-MSD Blaster Coil-Rapidfire Plugs-265/50/R15 Tires-Emmison's all Gone
http://members.aol.com/j007golden/91firebird.html
For info on certain parts or mods go to the site below
http://members.aol.com/j007golden/modeval.html

 

Definately go with the 3" 40 series single in/out muffler. It's straight through, flows the best out of all Flowmaster mufflers, and sounds great, none of the hollow nastiness which Flowmaster is known for. But whatever you do, don't run ANY Flowmaster without a cat, because it will sound like ****.

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91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

supposed 'peanut cammed' car (yeah, right)

Built on Wednesday

 

removeing ur cat is a waste. Its only good for about 1-2 hp and for all the polution ur putting out it really isnt worth it.

 

removeing ur cat is a waste. Its only good for about 1-2 hp and for all the polution ur putting out it really isnt worth it.

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1989 pontiac firebird
bright red exterior(just repainted)
grey interior
5 spd
305 TBI (stock)
WS.6 formula wheels
3.73 posi rear end
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system: 2 10" MTX thunder 2000 in a Professionally done custom bandpass box.
Blaupunkt CD player
Blaupunkt 4x6 and 6x9
600 watt rockford fosgate 4.6 amp

http://members.aol.com/j007golden/Mikey89.html