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3.5 inch pipe

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Old Apr 13, 2015 | 06:27 AM
  #1  
2slow5.0's Avatar
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Car: 91 Formula
Engine: 5.0 tpi slow
Transmission: WC t-5
3.5 inch pipe

Does anyone here know of a 3.5 inch over the axle pipe that is available from anywhere? Maybe Mufflex would sell it individually? I'm thinking of upgrading, the i pipe is no problem, but over the axle I think will create a challenge.
Thanks
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Old Apr 13, 2015 | 12:16 PM
  #2  
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From: Fort Wayne, Indiana
Car: 1989 Firebird Trans Am
Engine: 355
Transmission: T56
Re: 3.5 inch pipe

Why 3 1/2? And no, it'll have to be custom.
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Old Apr 13, 2015 | 02:35 PM
  #3  
midias's Avatar
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From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 3.5 inch pipe

http://www.hawksthirdgenparts.com/mu...ingle-cat-car/
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Old Apr 13, 2015 | 02:57 PM
  #4  
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From: Fort Wayne, Indiana
Car: 1989 Firebird Trans Am
Engine: 355
Transmission: T56
Re: 3.5 inch pipe

My guess was most people don't need 3 1/2 so they didn't make it
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Old Apr 13, 2015 | 11:37 PM
  #5  
2slow5.0's Avatar
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Car: 91 Formula
Engine: 5.0 tpi slow
Transmission: WC t-5
Re: 3.5 inch pipe

I've seen the mufflex system,I'm gonna contact them and see if I can get the over axle pipe. I can build the piping, it would just save some time.
I currently have the "almost 3" dynomax pipe with a Spintech muffler. I want to go to the 3.5" pipe to free up a little hp if possible, gives me room to grow without the overkill of the 4". I believe I can tuck a 3.5" pipe pretty well also.
Thanks
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Old Apr 17, 2015 | 11:47 AM
  #6  
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From: North Central Indiana
Car: 86 IROC
Engine: 383
Transmission: TKO 600
Axle/Gears: 3.54 Dana 44 IRS
Re: 3.5 inch pipe

https://www.thirdgen.org/forums/exha...fab-3-5-a.html
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Old Apr 17, 2015 | 01:45 PM
  #7  
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From: Double Bratville
Car: '89 Formula
Engine: LS2
Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt
Re: 3.5 inch pipe

I have 2" primaries --> 3" inters --> 3.5" single out. Pics are over the 9 bolt, now it's over the 12 bolt.
Attached Thumbnails 3.5 inch pipe-dsc00479sm.jpg   3.5 inch pipe-dsc00481sm.jpg   3.5 inch pipe-dsc00482sm.jpg   3.5 inch pipe-ls2-swap-026sm.jpg  
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Old Apr 17, 2015 | 01:55 PM
  #8  
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From: Double Bratville
Car: '89 Formula
Engine: LS2
Transmission: 4L65E
Axle/Gears: MW 3.42 12 Bolt
Re: 3.5 inch pipe

Stainless Works. You can only get the system thru Hawks. You might be able to get a piece from them.
Attached Thumbnails 3.5 inch pipe-dsc00859sm.jpg   3.5 inch pipe-dsc00867sm.jpg   3.5 inch pipe-dsc00868sm.jpg  
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Old Apr 17, 2015 | 06:08 PM
  #9  
Dyno Don's Avatar
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From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: 3.5 inch pipe

Here is my version of the 3 1/2" cat back.....
Attached Thumbnails 3.5 inch pipe-dcp_1447.jpg   3.5 inch pipe-dcp_1448.jpg   3.5 inch pipe-dcp_1449.jpg  
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Old Apr 19, 2015 | 08:19 PM
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2slow5.0's Avatar
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Car: 91 Formula
Engine: 5.0 tpi slow
Transmission: WC t-5
Re: 3.5 inch pipe

Nice work fellas. And thanks for the insight and help. I can fab the whole thing if I can get my hands on the bends in the right size. Just saves time if I can get something ready to go. I don't want a muffler or tailpipes as I already have that stuff.
Thanks again
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