Upgrade to 3" exhaust worth it?

jwboner · 01-17-2008, 10:53 PM

I've got a 347 ci with Trick Flow stage 3 cam and TF Track Heat heads with 10:1 comp ratio. And Accel DFI on top.
I had a custom exhaust fab'd up by a shop out of 2.5" from the Hooker Super Comp back that incorporates an H-pipe. Over time the lowest part has been flattened out some by low ground clearance.
I'm now thinking of replacing it with Pypes universal X-pipe with cutouts kit. But I don't know if I will see much advantage of using 3" pipe.
Has anybody switched from 2.5 to 3" and have any stories that they would like to share?

John

Dark_5.0 · 01-18-2008, 07:57 PM

Quote:

Originally Posted by jwboner

I've got a 347 ci with Trick Flow stage 3 cam and TF Track Heat heads with 10:1 comp ratio. And Accel DFI on top.
I had a custom exhaust fab'd up by a shop out of 2.5" from the Hooker Super Comp back that incorporates an H-pipe. Over time the lowest part has been flattened out some by low ground clearance.
I'm now thinking of replacing it with Pypes universal X-pipe with cutouts kit. But I don't know if I will see much advantage of using 3" pipe.
Has anybody switched from 2.5 to 3" and have any stories that they would like to share?

John

Nice set-up. I have ran 3 inch exhaust and it didnt run any better or worse than the 2 1/2 exhaust I had. My motor was a punk compared to yours, I would say your motor may benifit from 3 inch exhaust. i would also run 1 3/4 long tubes with it.

jwboner · 01-20-2008, 12:55 AM

Thanks for the input Dark.
The 1 3/4 headers are in the future.
Another problem I will run into is the X-cage that connects the two sides of the subframe connectors doesn't allow for much room for the pipes. By looking it looks like 3" will fit but just barely.
I'm trying to decide whether the hassle is worth the gain.

Supersonic · 02-01-2008, 03:26 PM

Quote:

Originally Posted by jwboner

Thanks for the input Dark.
The 1 3/4 headers are in the future.
Another problem I will run into is the X-cage that connects the two sides of the subframe connectors doesn't allow for much room for the pipes. By looking it looks like 3" will fit but just barely.
I'm trying to decide whether the hassle is worth the gain.

You're also gonna lose ground clearence, If you want to run 3" under a ground clearence restricted car, I'd suggest some oval pipes from Spintech! Ron is a great guy to work with too.

USMC302 · 02-04-2008, 01:12 PM

If your going to stay all motor, it's not worth the hassle IMO with your setup.

01-17-2008, 10:53 PM	#1 (permalink)
jwboner Registered Member Join Date: Jun 2001 Location: Under the hood Posts: 162	Upgrade to 3" exhaust worth it? I've got a 347 ci with Trick Flow stage 3 cam and TF Track Heat heads with 10:1 comp ratio. And Accel DFI on top. I had a custom exhaust fab'd up by a shop out of 2.5" from the Hooker Super Comp back that incorporates an H-pipe. Over time the lowest part has been flattened out some by low ground clearance. I'm now thinking of replacing it with Pypes universal X-pipe with cutouts kit. But I don't know if I will see much advantage of using 3" pipe. Has anybody switched from 2.5 to 3" and have any stories that they would like to share? John __________________ 65 fastback 347 DFI injected w/vic jr, TFS heads, MSD, cable clutch TKO, 3.70 9", tc subframe conns, custom traction bars, griffen alum radiator, armored fuel cell, and torq thrust D's Retrofitted Prelude seats. Vintage Air underdash kit. Fiberglass here and there too More on the way all the time.

01-20-2008, 12:55 AM	#3 (permalink)
jwboner Registered Member Join Date: Jun 2001 Location: Under the hood Posts: 162	Re: Upgrade to 3" exhaust worth it? Thanks for the input Dark. The 1 3/4 headers are in the future. Another problem I will run into is the X-cage that connects the two sides of the subframe connectors doesn't allow for much room for the pipes. By looking it looks like 3" will fit but just barely. I'm trying to decide whether the hassle is worth the gain. __________________ 65 fastback 347 DFI injected w/vic jr, TFS heads, MSD, cable clutch TKO, 3.70 9", tc subframe conns, custom traction bars, griffen alum radiator, armored fuel cell, and torq thrust D's Retrofitted Prelude seats. Vintage Air underdash kit. Fiberglass here and there too More on the way all the time.

02-04-2008, 01:12 PM	#5 (permalink)
USMC302 Registered Member Join Date: Apr 2001 Location: San Diego, Ca Posts: 1,266	Re: Upgrade to 3" exhaust worth it? If your going to stay all motor, it's not worth the hassle IMO with your setup. __________________

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