fiream

I need some help. I found 2.8 header for my 83 firebird. there hedmans' #68430. But now i need some advise. I want to run true dual exhaust. i'v came up with like 5 different plans to make the system work but none of them seem to good. The best idea i cam up with was to have pipes from the collectors run ove to the passenger side of the car into a double CAT then one pipe on one side of the part of the floor pan where in comes down lower then the rest and another pipe on the other side, into cherry bombs. Then over the axle and out the back it would look like a single exhaust comming out on one side but it would still be ture duals. I may put 2 pacesetter tip on the end to mellow the sound. I don't know, what do you guys think. does it sound good?

Fiream@yahoo.com

KED85

I am correct in stating that CT. is pretty heavy into real emissions tests?
If ya wanna, "make headers work" into one 3" cat, exit 3" from back into a two chamber Flowmaster, dual exhaust exit.
Make pipes showing, as two 3" pipes, also.


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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

Brian K

Dynomax cat back and use 3.4 headers and do a little custom bending...

Camaro_hunter_d

OK DO NOT RUN TRUE DUALS WITH A V6. if you want to run dual under the floor pan vist spin tech muffler they have oval pipes to help clear low cars. sorry had wrong link for a sec...
ok try this again here it its from askjeeves... http://www.spintechmufflers.com/

[This message has been edited by Camaro_hunter_d (edited May 30, 2001).]

TechSmurf

Keep in mind the amount of exhaust volume you (aren't) producing with the little 6 under your hood. It's gonna sound like crap. There isn't enough exhaust volume to make a true dual rumble. A single 3" pipe outflows our exhaust capacity. A single 3" Random Tech cat, and a single 3" dynomax or 3 chamber flowmaster and you're good.. if you want to try the bomb, go fer it, but I haven't heard any praisings of it on our cars.

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'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
Misc Mods: Cut air box, '83 Firebird spoiler.
Performance Parts: MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers.
Audio Mods: Pioneer DEH-P3000, two 12" Optimus Pro Audio subs in hand-made enclosure each powered by a 260 watt Optimus amp. Working on shaving the box for weight.
My Homepage, with pics.

TomP

Plus, unless you're welding it up yourself, just think of the $$ you could save. You could take the true-dual $$ and put it towards something else that'll do more for the engine. If many 305's and 350's are happy to breathe through one I-pipe, our V6's should be in paradise with it.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

Mister MOPAR

The 2.8 doesn't put out anywhere near enough exhaust flow to run a dual exhaust. A 2.5" single exhaust for that 105 horsepower motor is fine. Don't waste your money on headers and exhaust for the 2.8. Because the motor is heavily smog equipped, your $500 exhaust mod's aren't going to give you any more horsepower than stock. If you want real power and a rumbling, loud exhaust, buy a V8. There are way too many smog provisions on an early 80's 60 degree V6 to make any kind of power.

If you are looking for a 305 or 350 V8, I'll sell you one for 8 bucks.

Mr. Mopar.

Graeme'sFirebird

btw for ur info its 135hp/170tq

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1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil (Fireball in future) Accel 8.8 wires, MSD Ignition Module, Auto Meter Gauges (Water, Clock (needed one) Fuel Pressure, and 5" monster tach) 4th Gen Seats

Coming for my v6:
Panhard Bar, 4thgen front seats, Nitrous, Line Lock, and ram air 2 hood

"I'd rather run last in a full out race, than to not have run at all"

TomP

Fiream has the '83, tho, with the carb...

Ignore the "troll", guys!

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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

Camaro_hunter_d

Mr Mopar is just another idiot brggin the 8er. AND NOT EVEN THE RIGHT BRAND 8!. Anyway You could make a few mor ponies with a biger exhaust. NOT TRUE DUALS THOUGH!!!!!!

Graeme'sFirebird

Tom: Yea, hes comparing his car running against a non-efi 2.8.

TomP

Oh, okay.. when he said early 80's, I thought he meant 82-84... I see your point. Thanks!


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!