hey there. i just got a 88 firebird with a 305. i plan to put a flowmaster on it, but i have some questions. the car has the factory pipe from cat to muffler, do i need to replace that to something larger, or can i keep it and put the flowmaster right on it where my existing muffler is. also, the existing muffler has a bracket on one side and a strap bracket on the other. i can already hear it raddle as i drive. do i need to get some beefy brackets for support?
thx guys

 

Yes you can cut the existing muffler and weld in a flowmaster.I just had it done on my 87 formula.When I get more cash I'll put a 3 inch cat and 3 inch pipe to my 80 series.You should replace the stock pipes from the mufler back w/ mandrel bent 2 1/2 inch.For about $25 more you should get some chrome tips.

 

just get a cat back system...it includes the intermediate pipe...(the one between cat and muffler)....muffler and chrome tips. size ranges from 2.5 inch to 3 inch etc. its about 300 bucks.

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Rick
90 Camaro RS 305 TBI
400 small block, Hooker 1 3/4 super comp long tubes, Random Tech Cat, Hooker aero chamber cat back on the way!!
TH700-R4 with Trans-Go shift kit
MacEwen Motorsports White Gauge Overlays
K&N Filter Charger (wooohooo)
GTS Headlight and Taillight covers
5% Limo Tint all around
Classic White Chevy Bowtie sticker on rear window

Man if my camaro were a rice-rocket all those mods would give me what...easily 50-60 hp!!!

 

IMHO don't get the 80 series!! Save your money and get a nice cat-back exhaust from Hooker, SLP, or Edelbrock. Probably cost you roughly $300 bucks or so and is a much better buy. I have the 80 series on my 88 GTA with a 350 TPI. I have the converter removed and 2.5" pipe all the way back including tips. The sound is something I don't consider throaty, more like tinny. It has a hollow tinny sound at certain rpm's, WOT it sounds deep and loud, but a more calmer rpm's the sound is questionable. If I were you I would save your money!! I plan on getting rid of mine in the spring for a Hooker cat-back.

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88 GTA
L98 350
700R4
3:27 axle
MODS,
Edelbrock TES headers, 3" 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.