575 exhaust upgrade for a newbie

https://www.instagram.com/crownsandcavallinos?igsh=MTh4cWR1eWY2Ym5reQ==

I forgot, I could just link you to my Instagram. Looks for the post with videos

 

If you two go full Fabio on your 456 cars I may come with you on that journey.I assume there would be a “Trev” tune required for Fabio’s cat-less 456M set/up (?).

 

When I asked him about a tune for my 2.7 456GT he said it wasn't necessary, even going catless. But I know you guys with the 5.2 system have a bit more complex logic running

 

OBD1 doesn’t require tuning / no real CEL concern (unless you really screw something up). Tuning will give additional mild power bump.
OBD2 likely requires some kind of tuning as risk for CEL is quite real. Tuning also will give additional power.
Trev does not offer tuning 2.7 or 5.2 systems.

if enough demand, he may offer for 5.2?

 

I would strongly recommend AGAINST going catless. As Eric said, I received my 550 with the catless version of Fabio's headers (and with no secondary air). Knowing Fabio from previously buying a 599 setup from him, he agreed for me to send them back to him to be retrofitted for secondary air and I also bought his cats. It made a massive difference. The smell was unbearable with no cats - it was very unpleasant to drive with the windows down. I am not sure why - I did not experience this phenomenon on my catless 355, Delta Integrale, or even old carb 308. For some reason, the 550 was just horrendous. Adding the cats fixed the smell immediately.
Your preferences may vary, but I would think very carefully about this before proceeding. My .02. Good luck!

 

I don't have smell issues driving with the windows down on my 550 with Fabio's race headers and no cats. The smell is strong when starting the engine from cold and you don't want to stay behind the car then, but no issue when driving. Deleting the secondary air fixed a tedious whistle I was getting in the cabin when driving with the windows down by half an inch and over 60 mph.

 

That sounds like it’s a running rich problem and warrants mitigation through tuning.

 

So without doing the Full Monty on the exhaust of my 2003 575M, I'm trying to decide whether to replace the center muffler with a Fiammenghi H pipe or the rear mufflers with Fiammenghi Straight Tips? I'd prefer a low growl ala Ferraris of old vs the high pitch scream of current ones (someone here said us old guys should leave it stock, well I have a few choice words for the impudent young whipper snapper). I already did the TAZ bypass so the muffler valves are open all the time and its much better but it still needs a bit more sound.
Recommendations from those in the know please.

 

If your assembly number is below 51797, you have the center resonator/cork that is eating a lot of your exhaust music. Replacing that with an H-pipe will open up some sound and hp, and Fabio's will not resonate. Sound should be like what you have now, only louder.

If your AN is above 51797, you have straight center pipes and no resonator, and an H-pipe will improve the sound, but not be much louder, if any.

 

For low growl, you definitely need to replace the OEM center muffler on an early (pre midpipe delete) 575. You didnt mention your SN so not sure if your car already has the midpipe delete or now. If it does, I would just do the headers+cats and see how you like it with OEM midpipe delete and open OEM valves before buying everything.

If your car does not have the delete (aka pre 51798ish), I would get the H pipe + overaxle pipes and keep your OEM mufflers w the values open

 

Assembly Number 50034 so has the center muffler.

 

Then I would get the H pipe and over axle pipes but leave your mufflers

 

Why the Over The Axle pipes? Restrictions or part of H Pipe?

 

Restrictions and effort if already swapping H pipe is minimal

 

Affirmative, the factory over the axle pipe is severely constricted. Either Fabio or Supersprint make good over the axle pipes. If getting Fabio's H-pipe, might as well get the matching over-axle pipe.

 

Interesting thread. I’ve researched the forum and YouTube for several options. I quickly found out that the Tubi wasn’t an option for me. I heard it irl in a 550 and didn’t like it.

Then I thought of Capristo, but after reading many positive comments about Fiammenghi I’ve contacted him regarding his valved mufflers. Specially after watching this video, which - as I understand - is a solution with only his mufflers. And it sounds incredible.


He has recommended me to go for a H-pipe plus valved muffler solution. I want a more high pitched sound. I don’t like the deep growl/rumbe/V8 like muscle car sound. I like more the classic Ferrari and 90’s Formula 1 sound.

But I also want to keep the possibility of converting back to original setup, keep the cost down and be able to get the car through periodic inspections. Therefore the full option with headers etc is out of the question for me.

I am therefore considering to go with either:

1. Fabio valved mufflers
2. Fabio valved muffler + Fabio H-pipe

My vin number is 128196, unfortunately I don’t know my assembly number, but it’s an 2002, so I think I have mid muffler on it.

I wasn’t considering going with only a H-pipe, until I read these two esteemed members comments, but now I’m in doubt, if that is an option.

 

Fabio usually recommends the h-pipe, I believe it may have been because of optimizing power output (id need to clarify). That being said, even with the equal length headers it still has more of the classic old school growl than I personally wanted with the h-pipe. I just swapped the exhaust on my 5.0 Superleggera from Capristo to a Kline inconel x pipe and the difference is incredible. I am considering putting Fabio's x-pipe in the 575 instead to smooth out the sound. If I were to do it again I'd got with the x pipe for sound, can't speak to power output with certainty.

 

The free flow mufflers is certainly a cost effective way of getting more sound. But I don’t think it will pass the inspection.

 

I just found my assembly number. It is 45346. So it has the central muffler.

 

That’s the thing buddy. Here in Denmark during inspection the vehicle must not exceed the noise levels that were applicable at the time of first registration. It can therefore be an issue if you don’t have valve control.
So my options are either 1. H-pipe, or 2. valved mufflers with/3. without H-pipe.

 

Small detail here.... but with the muffler only but its going to be 10's of LBS, not even close to 100...

Weight difference from a stock 456 box to a 550 Tubi was only about 10lbs per side. The 550 rears aren't even this big
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