1975 308 gt4 single or dual exhaust?

Kalifornia · 08-28-2010, 04:32 PM

Hello, looking to purchase a 1975 308 gt4. One that I am looking at has a single exhaust, instead of the dual exhaust that I have seen on nearly every other model? Can anyone enlighten me on if this is unique to this year or model, an option, or is it missing 1/2 the exhaust? If it is standard, does this affect the performance. This car is located in the US, I have only seen photos of one other gt4 with a single exhaust, located in Europe. Thanks for your insights.

wetpet · 08-29-2010, 05:23 AM

all have a "single" exhaust. just some have two sets of tail pipes coming out of it. Easily changed back with a correct muffler.

Kalifornia · 08-29-2010, 08:27 AM

Thank you!

dinogt4guy · 09-01-2010, 08:18 AM

I have never seen one with a single exhaust. Odd.

212Export · 09-06-2010, 06:02 AM

That "single" exhaust most likely comes from a 308 GTB/S (maybe as a replaqement over the years) as the first series 308 GTB/S (the carburated) had single exhaust pipes.

212Export · 09-06-2010, 08:40 PM

Sorry, but I checked Keith Bluemels V8 reference again and on the 308 GT4 exhaust he writes:

"On european cars each bank of cylinders had a four-branch tubular stelel exhaust manifold, whereas US and Australian models had pressed steel collector manifolds with air injection points. The forward manifold fed via a single pipe to a flanged connection into the righ hand side of the silencer box, while the rearward manifold fed in the same manner into the left-hand side of the silencer box....The exhaust gases exited through two pairs of chromed tail-pipes pointing directly rearward except for US models, which used tail-pipes with a 90 degrees bends to direct exhaust gases towards the ground. As this was not very pleasing aesthetically, Ferrari effected a modification in July 1975, so that dummy tail pipes shrouded the downward-facing pipes. Additionally US and austalian models were fitted with an evaporative loss system and an emission control device that injected air into the exhaust valve ports"

Hope that helps a little to bring light into the subject.

08-28-2010, 04:32 PM	#1
Kalifornia Join Date: Aug 2010 Ferrari Life Posts: 2	1975 308 gt4 single or dual exhaust? Hello, looking to purchase a 1975 308 gt4. One that I am looking at has a single exhaust, instead of the dual exhaust that I have seen on nearly every other model? Can anyone enlighten me on if this is unique to this year or model, an option, or is it missing 1/2 the exhaust? If it is standard, does this affect the performance. This car is located in the US, I have only seen photos of one other gt4 with a single exhaust, located in Europe. Thanks for your insights. Attached Images

09-01-2010, 08:18 AM	#4
dinogt4guy Owner Join Date: May 2005 Location: Hewitt, TX. Ferrari Life Posts: 165	I have never seen one with a single exhaust. Odd. There is nothing like a Ferrari, there never has been and never will be!

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08-29-2010, 05:23 AM	#2
wetpet Owner Elite Member Join Date: Jan 2006 Location: Chevy Chase, Md Ferrari Life Posts: 6,603 Name: Ed	all have a "single" exhaust. just some have two sets of tail pipes coming out of it. Easily changed back with a correct muffler.

08-29-2010, 08:27 AM	#3
Kalifornia Join Date: Aug 2010 Ferrari Life Posts: 2	Thank you!

09-06-2010, 06:02 AM	#5
212Export Owner Elite Member Join Date: Oct 2007 Location: Europe Ferrari Life Posts: 2,288	That "single" exhaust most likely comes from a 308 GTB/S (maybe as a replaqement over the years) as the first series 308 GTB/S (the carburated) had single exhaust pipes.

09-06-2010, 08:40 PM	#6
212Export Owner Elite Member Join Date: Oct 2007 Location: Europe Ferrari Life Posts: 2,288	Sorry, but I checked Keith Bluemels V8 reference again and on the 308 GT4 exhaust he writes: "On european cars each bank of cylinders had a four-branch tubular stelel exhaust manifold, whereas US and Australian models had pressed steel collector manifolds with air injection points. The forward manifold fed via a single pipe to a flanged connection into the righ hand side of the silencer box, while the rearward manifold fed in the same manner into the left-hand side of the silencer box....The exhaust gases exited through two pairs of chromed tail-pipes pointing directly rearward except for US models, which used tail-pipes with a 90 degrees bends to direct exhaust gases towards the ground. As this was not very pleasing aesthetically, Ferrari effected a modification in July 1975, so that dummy tail pipes shrouded the downward-facing pipes. Additionally US and austalian models were fitted with an evaporative loss system and an emission control device that injected air into the exhaust valve ports" Hope that helps a little to bring light into the subject.