1995 355 Factory Cats

Hello Michael,
I have a 99 and my left cat is shot, the right one seems fine though. I will know by Tuesday for sure if the right one is ok. I do not know which one is the 1st cat.
--tony

 

Thanks for the advice. I will call Ferrari of San Francisco Monday to see what they say. I am still leaning towards just getting the Hyper-flow ones.

Good luck with you cats.
--tony

 

This is a very trustworthy,competent,and 25 yr Ferrari mechanic who can have the cat rebuilt for you for a fraction of cost of replacment.

I recently researched this for myself but didn't need to replace it.
He comes highly recommended.

Heres his shop tel # Arizona time zone.
ANDY 480 836-7915

 

I put the Hyper-Flow cats on the other day after running with test pipes for a year. I did not like the sound of test pipes. Too loud and too much bass.My exhaust also smelled with test pipes. The sound is much better, alittle louder than just a Tubi, and the smell is gone. As far as performance, I didn't notice any difference between the new cats and test pipes.

 

Thank Meddav!

I just finished speaking with Bruce at Ferrari of San Francisco and he said F355 cats are always going bad and that he would replace mine under warranty. He said he would not do both if the other one was not bad. The earliest he could get me in is the first week in July. I asked him if he had any comments on the hyper-flow or max-flow ones and he said he only works with OEM......

If the OEM ones are crap, I do not want to put them back on. He also said I should truck the
car up there because I am in danger of cloging the cat and destroying the manifold.

Now to decide which to choose. Help

--tony

 

When I put my Hyper-Flows on, all the threads needed to be retapped, the flanges where not round and did not fit without shaping them with a hammer and the pyros bottomed out on the cat material. After all that, they fit fine. Hope you have better luck with the install. Mine were some of the first made so they may have gotten better. All the problems were with heat when thing were welded. Once one, they are beautiful.

 

That is great news Michael. I am not much of a mechanic, but I can turn a wrench. I will know for sure if I am getting the hyper-flow ones by Wednesay morning. I drive my car everyday to work but now I may not drive it until I get the new cats, I do not want to risk breaking something else with a cloged cat.

--tony

 

These are not terrific problems. Retapping is no big deal and mine was an early cat when they were just making them. I bought them about 9 months ago and just put them on four weeks ago and was running test pipes for a year. They still sound so much better than test pipes and the reduction in engine heat is great. My engine bay would be very hot after a hard run and with these cats as was with the test pipes, engine bay heat is greatly reduced.

 

I have Tubi muffler but stock headers. I have a Challange chip and the
GruppeM intake.

 

What difference does the GruppeM intake and Challange chip make over the standard equipment ?
thanks,
--tony

 

The Challange chip is supposed to make 15Hp and raise the rev limit to 9000rpm which it does. It was off a Challange car from NY. The GruppeM intake filter is just like the ones used on the Audi and Corvette LeMans cars. It is a K&N filter. The car is much more responsive above 5000rpm then it was before and pulls harder. I have not put it on a dyno, but have driven other F355 from 95 and my car is faster.

 

bob, do you want to sell the test pipes. Im looking for a used set for a 95 2.7. Also If you ever want to get rid of the gruppeM Intake/chip tell me, ive been looking for a used on. they want 3k for a new one.

 

i put a tubi and hyper flow cats on my f355 1995 10500m i have the OME cats if you need.
Thanks f355b