355 challenge question

You may try sending a PM to Jon Kofod user name:FLATOUTRACING as he converted his stock 355 to a challenge.

 

Engine wise, A 355C IS a stock 355, but with a challenge exhaust silencer fitted! To "re-produce" the sound...buy a 355C exhaust....Ta daaa!

What is hard to know without looking, is if the cats are really still there...many are just hollowed out cases and the expansion chamber that remains makes a lovely sound....

 

aaah, smog schmog. Do the test and change it after!

 

If you cannot get hold of a standard Challenge system, buy a system from QV London that is an exact replica. I have it on my car, and it doesn't sound bad. I also have a Tubi Pipe Only system, that has no silencing. This is like the Challenge Spa system . I have been warned that this is too loud. However, I have to try it once.

I will let you know how it goes.

Roger

 

If I'm not mistaken, 355 Challenges that ran in the North America series did have cats. I know that to be true of the 2001 season.

 

Not entirely true; but not far off. ALL 355 Ch regardless of year run the 1995 spec engine management, which some say has an effect on engine note. There are actually THREE different spec 355 Ch exhausts. The original spec was merely changing the street muffler for the smaller "challenge" muffler. In 1998 the "98 kit" added a "hollow Y piece" which removed the Cats at the top. It also included a hollow tube that replaced the bypass valve in the exhaust. So in 1998, you had the earlier muffler, hollow Y piece and no bypass valve. The 3rd exhaust option was a "Full race" un-muffled straight through system in place of the "normal" challenge muffler. This version was loud enough to make your ears bleed. I had the 1998 spec exhaust on my 355 Challenge and I still think it was the BEST sounding modern Ferrari. Even better than my 360 N-GT.

Good luck buying any of these 355 Challenge parts today. They were produced in a very limited run. Best option would be to contact the Ferrari dealers who ran/supported 355 Challenge teams.

 

I have a challenge muffler(not straight thru pipes) on my 98 355tb. It is about one half the size and weight of the street muffler. It requires a separate cross piece to hold it on but it is not difficult to install. I left the cats and the exhaust by pass valve intact. It has a good sound but not too loud as to be intrusive. I was concerned with the heat generated and wanted a better sound. Perhaps there is a slight power improvement but not discernible to me. I have decided that the only way to get any real improvement in the underhood heat is to replace the cats and install a challenge real grille. Price was about half of a Tubi but installation was more involved. If you decide to buy a challenge muffler, be sure it has not been bent in a rear end collision as that is not uncommon.

 

The above info is correct. As for finding one in the US (muffled), there are none left and the factory in Italy has none.

My Challenge car came with the 95 spec exhausts. The straight pipes sound the best. Unbelievable sound but will never pass a street noise test.

I know of at least two Challenge owners here in the US trying to hunt one down and the only one left is mine which was sold with my car to a fellow Ferrari chatter. My "muffled" exhaust has never been installed.

Regards,

Jon P. Kofod
www.flatoutracing.net

 

does anyone have a picture of what that unmuffled loud exhaust looks like?

 

Search the archives. Been discussed many times.

In short, yes it can be legally done, if you remove the kit and have the car re-inspected.