TR Test/Race pipes

I had custom bypass pipes made as it was cheaper...

Big difference in heat generated... not much difference in sound...

 

With a stock muffler there really is no difference in sound.
I have seen many different levels of fit and quality. Its a big mistake to think they are all equal.

I have these and always considered them the only ones that are really a quality piece but the company that made them went out of business years ago.
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Toss the pre-cats too.

 

I think the pre cats tend to be gutted out on most cars by now, and is one way to get rid of them. I’ve read here that test pipes will be lighter, and depending on material may radiate more heat, but will not affect sound.

The OEM hardware bolts/nuts/springs/spacers for the flange/joints are crazy expensive if you choose to replace. I think the nut is actually copper (plated?) and has a slit, presumably Marenello’s answer to a simple double nut that the proletarians use.

I had saved off some aftermarket replacements, it may save you some time
Nuts https://a.co/d/4o0KSzH
Exhaust donut, large is Felpro 8194, anybody have a source for the smaller donuts?

I measured my non-OEM precat bolts to be M8-1.25x75 and the sleeves to be M8x23. If anyone has a link for online purchase that would be helpful

 

those nuts are only M 5 but you need M 8
but I wonder: in the description it says thread size M 5 but also a little more down it says copper lock nut 8 mm. normaly a M 5 nut has a 8 mm head. but never have seen a 5 mm nut like this one in the picture. also a M 5 nut has a thread pitch from 0,8 mm, the M 8 is 1,25 mm and so looks this nut.
again one more mistake at the amazon description

 

As I said just above the picture there is very little difference in sound. Very few would notice a difference right next to a complete stock car.

They were made by Hyperflow, a fly by night cat manufacturer that went out of business. The bypass pipes were the only good parts they made.

 

Precats are only gutted on cars with a history of poor quality service. Its an easy way to tell if the mechanics were any good.
How can a test pipe possibly radiate more heat than a cat?

 

Did anyone got a CEL (I think I have read ppl getting SLOW DOWN, Cyl Bank too hot CEL) from removing the precats or the main cats?

 

I removed the cats and replaced them with test pipes, then I removed the tin shielding on the pre-cats and took out all the inner wire matrix, making them straight pipes (how many times have you parked your Ferrari on a field of dry grass where a fire could be a danger?). The car (94 512TR) already had a tubi. The sound now is much better but not overwhelming. I still have the cats (removed at 11,000 miles) if anyone needs a set for emission inspection (no such thing here in Florida).

 

There is no CEL on a TR. Exhaust temp high enough to trigger cat overheat with no cat is not possible.

 

Some people reported getting SLOW DOWN, Cyl Bank 1-6 / 7-12 Too Hot CEL.

 

Some people are stupid and have no idea how the car works.
I do.

Again. A TR has no CEL so if it lights up, better call ghost busters.

 

Testarossas have no CEL
What you are referring is the “slow down Cyl 1-6/7-12” warning light (with a really annoying buzzing sound” those are measuring at the thermocouples and they are passive in nature, so there will be no limp mode or bank being shut down, the issue might be a clogged cat but also those ECUs tend to go bad on several ferrari models, I believe the problem is moisture, and they start acting up, if you don’t have precats/cats you don’t need to connect those thermocouple ECUs.

 

what please is CEL?

 

Clogged cats dont overheat. An overheated cat will clog itself as it breaks up.
You have cause and effect backwards.

 

CEL = Check Engine Light (of modern OBD/OBD2-equipped cars -- TRs don't have "On-Board Diagnostics")

 

I believe there are two thermocouple ECU's on the 512TR, tucked under/near the fenders. Disconnect the ECU's from the harness and tape them off in case future owners need them. Problem solved. I did this 59,000 miles ago and I have not seen a light yet.