f355 exhaust

No.
1) Get a Capristo...any level, they are all awesome
2) The exhaust manifolds will fail....when they do, replace them.
3) The Capristo bypass is a nice piece, but unnecessary if the stock one is working. I got the Capristo bypass valve on my car, because I thought my valve was rattling...it wasn't.

 

Factory ones if you have high-flow cats installed.

Or, any company that makes 4>2>1. Some make 4>1 but that will affect the sound.

 

How does it affect the sound?

 

There are several companies that rebuild the factory exhaust manifolds, and maintain the 4-2-1 relationship, those would be best. I would NOT recommend QV London, as they do not reinstall insulation under the heatshields...and for this reason, you can get rattles from the heatshields (I had to have insulation added later to correct this, at my expense). I believe Quicksilver rebuilds them correctly.

 

People have commented that the 4 into 1 design causes the pitch to be lower, so you lose some of the high pitched scream the F355 is known for.

 

My tubi is nice. Anything louder (Capristo) and I'd be kicked out of my neighborhood.

 

It is hardly noticeable, if at all, if you are running high flow cats or catbypass. The Torque advantages of a 4-1 is WELL worth it IMO and when combined with a nice exhaust + cats/CB the car will sound AMAZING. The F1 scream is definitely achievable with the 4>1 headers, I have done it with my exhaust as well as others

Evan

 

It all depends on what sound and loudness you are looking for. I have a custom pipe arrangement and no muffler, stock headers and stock CAT's. It's loud as hell, but not that loud in the car coz the sound is left behind. It's similar to a challenge exhaust.

It sounds awesome - just awesome. My neighbor does not like it but I drive the car a few times a week for around 5 months so he'll have to live with it or move
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Capristo is only noticeably louder on bypass. So it is fine until you dip into it, then all hell breaks loose.

 

Yep. 4-1 is going to yield a bit more poke too, which in an already peaky engine like the 355 only accentuates what it already is. 4-1 header, no question.

 

What makes you say that QV do not reinstall insulation under the heatshields?

 

Cause my most recent set did not have any! One side rattled terribly, and the dealer tried to correct it, and said the only way to do it properly is to take apart the heat shields and install insulation as intended. Not sure on the first set...which lasted around 25k miles until they failed...did anyone know that until recently, QV London only replaced the first 10 or 12 inches of tube? Now, they replace all the way to the collector....go figure. That was not how they described their work when I originally bought them 7 or 8 years ago.

 

That's ghetto.

 

You'll have to forgive me, but I thought that last time I looked at the torque curve from just adding your headers, although the peak torque was higher, there was a dip in the curve just where I would like it be greatest (ie. 3500-6500 rpm).

I am happy to stand corrected. Can you clarify please?
I am less concerned with absolute numbers but would like more torque in the range I mentioned.

Thanks.

 

I have a stage 3 capristo on my 355 and it's awesome. Switch installed in cabin so can open/close valve as I wish. Perfect!

 

I have fabspeed headers, tubi exhaust and straight pipes. Yes I noticed a lower pitch with the same set up and factory headers but there is a noticeable increase in mid torque. You will feel it just as you will notice the lower pitch.

 

Thanks for that.
I currently have Hyperflow cats, Nouvalari exhaust, and standard headers.
Thus, sooner or later I'll have to either replace or rebuild my headers.

The one thing I am absolutely NOT prepared to sacrifice is the amazing F1 sound that I currently have.

I'm leaning towards either a rebuild or Tubi headers (despite utterly ludicrous price) mainly because of the 4-2-1 design.
It's a tough call as I'd really like more mid range, but I'm not interested in changing the sound to achieve it.

 

Doesn't the 4-2-1 give more midrange than the 4-1?

 

Well, that's what I always thought.

Hence my question along the lines of:
I don't care about ultimate numbers, I want torque in the midrange (where it is actually useful) and I don't want my car to sound different (read:lower) than it does now.

 

You mean it's not useful at higher rpms? BS. I rarely, if ever, drive around at low rpms and full throttle, which is where increased mid range torque will be felt. However, I'm always at full throttle at high rpms which is where more torque (and hence, power) will be felt and used.

That said, I doubt there is much difference in the headers alone and I've seen zero dyno evidence of aftermarket headers alone doing anything for performance.

 

No, it's not useful above 6500 in a 355.

Anything else is BS.

 

Right. So if there's no mid range torque advantage in 4-1 headers, why would you sacrifice the awesome sound of the 355?

Considering that, above all other Ferraris is what makes this car so special?

 

What? This makes no sense. When I drive my car hard, which is when I want the most power, it never goes under 6500rpm. So, above that rpm is where I want more torque and hence power. That's the (supposed) benefit of the 4-1 header, but I'm dubious as to how much the available headers actually add there.