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Old 11-09-2010, 03:47 PM
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Exhaust for firebird

I can't decide where i want to put the muffler on my 78 firebird. I don't have a lot of money to spend so i'm getting a dual in/out 2 chamber muffler, this way it acts like an x pipe too. I want to make the exhaust as short as possible cuz i don't have very much money and i don't want to buy a lot of pipe. More pics of the undercarriage are here: http://transamcountry.com/community/...?topic=12686.0 Would it be alright if i just put it under the floor pans or would it be to low for speed bumps? Thanks in advance.

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Old 11-09-2010, 03:52 PM
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If the pic doesn't work you can right click and open it in another window.
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Old 11-09-2010, 03:58 PM
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Quote:
Originally Posted by bigdog7373
If the pic doesn't work you can right click and open it in another window.
The link works i was just trying to see exactly where the mufflers were at .
Couldn't see them. Mine set pretty low but don't hit any speed -bumps but does rub enough to bug me when pulling it in and out of the garage. Been thinking of seeing if they can be tucked up alil bit tighter not sure yet though haven't looked.




Cole
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Old 11-09-2010, 04:04 PM
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the pic isnt my car, i was just using it as a reference.
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Old 11-09-2010, 04:07 PM
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Quote:
Originally Posted by bigdog7373
the pic isnt my car, i was just using it as a reference.
Yeah i know that wasen't your car I was trying to see where he had his at in reference to mine.


Cole
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Old 11-09-2010, 06:22 PM
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you'll be fine , mine are in front of the rear axle .
a Pypes 2.5" (X) system
just keep um as high as you can.
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Old 11-09-2010, 07:06 PM
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Alright, let me rephrase the question. I can only afford one muffler so i'm going with a dual in/out muffler to also act as a crossover pipe. I still have the factory manifolds, no headers yet. Look at the pic and tell me if you think it would be ok to put a muffler where one of the yellow circles are. This is only temporary until i get money to put a complete dual system on it. I just don't want it to hit the speed bumps because i have to go over them every day. Thanks
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Old 11-09-2010, 07:31 PM
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you should be fine on the right (pass) side.

thats where GM put the catalytic converter.
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Old 11-09-2010, 07:40 PM
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Quote:
Originally Posted by 4speed
the right (pass) side.

thats where GM put the catalytic converter.
Oh yea, thanks. I forgot this car had a converter originally; it was long gone when i bought the car.
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Old 11-09-2010, 07:58 PM
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this is what mine looks like in the first pic .

but stock looked like the 2nd pic , only with out the left side pipe and the x-over. one pipe going back to the muffler and dual out to the quarters
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Old 11-10-2010, 06:51 AM
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my magnaflow dual in/out muffler was $100+. You can get 2 welded thrush chambered mufflers cheaper than that. What muffler are you planning on getting?
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Old 11-10-2010, 03:34 PM
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Quote:
Originally Posted by 6426yy
my magnaflow dual in/out muffler was $100+. You can get 2 welded thrush chambered mufflers cheaper than that. What muffler are you planning on getting?
Thrush 2 chamber welded, it's 40 bucks for the dual in/out muffler. I'm hoping it won't be loud, just good sound.
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Old 11-10-2010, 04:41 PM
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Anyone have these or heard them before? Are they loud? Like, compared to a turbo muffler.
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Old 11-10-2010, 05:27 PM
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I have on my 78 trans am, f-bodies are awesome!, 1 5/8 full length headers into 3 inch pipe, into a 12inch galsspack, into about 3 foot of pipe, and have a turndown right at the rear end yoke. but everything is tucked up into the trans tunnel, and has about 6 inches of clearance around the driveshaft. The headers will smack on a speedbump is i hit it fast enough for the suspension to move, but if i just creep over they clear.

Before i had this system, i had 2.5 pipe run from the manifolds back to flowmasters just before the rear end. cost me 154 bucks, but i already had the mufflers.
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Old 11-10-2010, 05:28 PM
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you can get some summit brand mufflers for about 25 bucks a piece. or you can get some glasspacks from summit for $18 and up.
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