original GTSi muffler hinged access to insides?

I would lose all that "lard" and put in a Tubi and a test pipe. Its such a welcome difference. You have no idea how restrictive and hot running that the factory system runs . I did my 89 23 years ago and never looked back.

Big G

 

I doubt removing that would expose the muffler internals as the entire perimeter seam not being fully welded, it would leak exhaust gas. More likely it's just additional heat shielding and there is some insulation material under that "cover" piece (between the cover piece and the actual gas-tight outside case of the muffler) -- but just guessing.

 

I have looked at those straps too and have wondered the same thing. It certainly looks like a door. Yeah, the insulation theory makes sense (darn it); there is no sign of gas leakage.

I need to open up the muffler. I have a rattle in there somewhere.

 

Are those “cat cooling tubes” standard? It seems like somebody put them there afterwards.

I went with the Fabspeed sports cat and a Tubi and I’m really happy. getting rid of the thermonuclear oem cat is a must.

 

I remember a thread where somebody open the muffler. It has pictures IIRC

 

This is my 328 OEM muffler and to me it only looks like a heat shield cover, that it’s welded on top.

 

Yes, the 'cat cooling tubes' are indeed factory standard OEM, at least for US spec 2Vi models. I can't speak to any other country nor model year specs.

Here's the OEM components (first pic) that I removed when I replaced all the bits with an Ansa (second pic). The first picture shows a Stebro muffler that I had at that time, and you can see the noted 'cooling tubes'.

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The shown 'cats' had been gutted by a previous owner sometime in my car's past.

 

Careful about "test pipes" if you live in a state where smog test is required. If we like it or not its coming to most states and the fines are substantial if the smog tech notes modification and classifies it as a "gross polluter" . In Calif, NY and a couple of other states your setting your self up for a world of hurt. I have a friend with a 308 that ended up paying almost 5K including fines to get it through smog.

Barry

 

View attachment 3649539

Here is the airflow - I can't speak to the restrictive nature of the airflow but it does not look very balanced.......I would think that the right exit tip would get the most exiting gases. I'm unsure how one could improve the restriction without ruining the muffler. I still prefer to clean up this original exhaust system(maybe new free-flow cats) as I look at the bigger picture of getting this 2V back on the road.....maybe restoration round #2, years from now, will include a superior aftermarket exhaust upgrade.





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I would drill holes in the exiting pipe in the chamber that receives the inlet so some of the exhaust bypasses the rest of the muffler

If you drill holes in the pipe that carries your blue lines - so that some of the gases follows the green lines

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No and by the way. All that is easily accessed with the bumper in place.

 

Yes.

 

Stock from Ferrari.

 

I would drill holes in the exiting pipe in the chamber that receives the inlet so some of the exhaust bypasses the rest of the muffler

If you drill holes in the pipe that carries your blue lines - so that some of the gases follows the green lines

View attachment 3649562




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Many rear engine Ferraris from the period had imbalanced flow from the 2 pipes. Dont forget, the higher powered EU versions often had pipe on one side only. Pipes on both sides was done for the sake of appearance, not performance. How many exit pipes do you thing a 180 cubic inch motor needs. Many dyno tests have shown Ferrari mufflers with cats removed to make more power than aftermarket systems. If you want more noise, fine. If you want less weight, fine. If you want more power, save your money.

 

What is this DIY vapor blast cabinet you speak of?

I'm going to "de-rust" my exhaust, and my plan so far is to maybe get a large container and just drop it into some evaporust.

I did a little sandblasting on the diaper and it was messy as hell so I'm looking for a different solution.

 

Awesome... yep just did the diaper. I did sand blasting which worked but was quite messy outside. Not a huge deal, but it was messy. I had a harborfrieght gun no cabinet.




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