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Old 01-29-2019, 05:14 PM
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leeklm leeklm is offline
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Default 3" for first gen firebird?

Summit has a sale on Pypes exhaust- was thinking of ordering now to save a few bucks. My initial thought was 3" rear qtr exit and 3" Ultra Flow mufflers. I liked this combo (same 600hp/crank engine) in my Abody.

Those with an fbody... how well do the 3" pipes fit in the tunnel area? I have a 3.5" driveshaft- and am thinking things could get a little tight.

2.5" would likely work fine as well- but most folks claim a little better HP with a 3" mid at this power level.

Thanks!

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
  #2  
Old 02-01-2019, 11:40 AM
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Speargun Speargun is offline
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I have the Pypes 3" system on my '67.
I'm running Doug's headers and custom motor mounts so your application may be a little different.

Cons:
One of the parts at the rear was clocked wrong and had to be cut & re-welded, but that was probably just a one-off mistake.

The pipes hang an inch or two lower than I like & could use an "S" bend at the front to raise them up. This may be due to the custom motor mounts that sit the engine lower than factory.

Pros:
Very nice looking system.

Plenty of clearance once adjusted although it is a little tight at the quarter exit.
I have a Tanks Inc. notched gas tank, but I don't think a factory tank would cause any trouble.

The race pro mufflers sound good, but I swapped them for Dynomax turbo mufflers to tone things down a bit since most of my driving is around town.
The race pros really sound off when you get on it.

If I had to do it again, I would have my local shop build the system with 3" to the mufflers and then 2.5" to the quarter exit for the same price as the Pypes kit.

I don't think there will be any problem with driveshaft clearance.

Here's a few pics -












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Old 02-01-2019, 11:48 AM
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Thanks for the note. Regarding your comment of having custom pipes bent for the same price as Pypes kit... I really need to find a cheaper shop!! Local guy I use does great work, but hard to get out the door for anything less than $1k!!

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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Old 02-01-2019, 01:11 PM
grandam1979 grandam1979 is online now
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Speargun the other thing you didn’t mention is you have a notched tank he can’t run his pipes like you did. Also I just changed my system from 3” with reducing cones at the mufflers 2.5 mufflers and tailpipes to 3” out the back only mod I had to make was cut 1.5” off the end of both 3” tailpipes. I think it’s going to pick the car up 1-2 tenths and a couple mph.

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Old 02-01-2019, 01:32 PM
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I should mention that I also plan to run the Tanks Inc. Or Aeromotive tank with notched corners. I like the Aeromotive tank, but not sure it is worth the $200 premium over Tanks with same pump.

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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Old 02-03-2019, 02:55 PM
grandam1979 grandam1979 is online now
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This is my 68 just changed out the 2.5 mufflers and tailpipes to 3.0
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  #7  
Old 02-04-2019, 10:16 PM
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Do they still make that oval pipe? I cant remember who made it. That'll help with clearance. I guess if your really good you can do they whole thing in oval!

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Old 02-05-2019, 11:26 PM
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Quote:
Originally Posted by 4dblnkldude View Post
Do they still make that oval pipe? I cant remember who made it. That'll help with clearance. I guess if your really good you can do they whole thing in oval!
Spintech is the company.

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  #9  
Old 05-07-2019, 09:46 PM
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Got the 3" in today. Used the Flowmaster qtr exit kit with H pipe. Installed with 14" Dynomax ultraflows. A little snug but fit well. Ultimately I would have liked 2.5" tail pipes. Sound clip...

https://youtu.be/ROZhBljveUg

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
  #10  
Old 06-29-2019, 12:08 PM
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Default exhaust

On my 69 firebird, I run Dougs headers with 3" Pypes X middle, Ultraflow and Flow master 3" over rear behind tires, tight fit but it sounds good with my 455.
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Last edited by 69FIREBIRD76MM; 06-29-2019 at 12:15 PM.
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