1990 mondiale T ???test pipes??

I put Hyper-flow cats (something like 95% of test pipes regarding flow) yet pass smog requirements (at least here in CA). The silencer that you use (muffler) is not as important as what's in front of it. Test pipes or Hyper-flow cats, you'll come out ahead.

Good luck

 

I run test pipes on mine all the time, except when I need to smog (BTW - car will pass with test pipes every test but one).

Never had check engine or slow down lights come on, ever. Been running w/o test pipes for first 6 months, then last 19 months with them on. Never had the problem w or w/o the test pipes.

 

I had a 90 Mondial T. I ran test pipes on track and Random Technology catalysts on the street for quite a few years. In addition to making the car street legal, the catalysts were absolutely essential for passing emmissions tests. There were no check engine lights until the much later in ownership when the O2 sensors had aged (I bought the car with 14000 miles and ran it till 63000 miles). After replacing the O2 sensors the check engine light went away, only flashing on rare occassion but this was usually a loose connection elsewhere.

The combination of free-flow muffler, K&N filter, and (either improved catalyst or straight pipe, as I don't remember which I dyno'ed) was good for approx 20hp. I did not try the items separately. With the straight pipes, I could blow leaves off the driveway at idle, let alone after applying the throttle ;-)

 

The slow down light triggers off a temperature sensor wired in to the cat - the light comes on when the temp in the cat gets too high. You won't have this problem with the test pipes as the exhaust will run considerably cooler. You can either just tie wrap the temp sensor up and away, or, have it plumbed into the test pipe for the heck of it - doesn't really matter. Your car will be considerably louder with the test pipes... On the environmental side of things, it's likely you'll still pass emissions without the cats but keep them around in case not!

 

My car got test pipes at the beginning of this year .. .. for testing purposes only of course ^^ I bought the ones from Tubi which already have a hole for the sensors.

The engine sound was slightly louder afterwards w/o any significant increase in power. I personally feel the car is underpowered with or w/o test pipes. And it was only after the installation of a custom build sports exhaust that the sound turned into what a F-car should sound like.

As you have already installed a Tubi I wouldn´t expect vast improvements wrt sound. The only argument that speaks for test pipes are the decreased temperatures in the engine bay.

There is one big disadvantage: My t is a convertible and at stops the smell from the exhaust w/o the cats is unpleasant.

 

Agreed... but with a slight caveat: the HyperFlow cats will flow 30% better than stock cats -- so even with them, you're getting a much cooler butt-end. Test pipes would add some additional flow and naturally be slightly cooler. At the point of decision about test pipes vs. HyperFlow's, you're miles ahead of stock equipment anyway. It's more a decision about emissions testing and personal preferences.

Just my 2 pesos and 12 dirty diapers,
Daniel

 

If I had to decide again I would rather go for the Hyperflows .. .. much more convenient ...

I wasn´t satisfied with the engine sound .. .. and from some threads here I gathered that test pipes are the way to go. Well, I would say they make the car slightly louder but are not really an improvement over the sound with cats in my car. Others might come to different conclusions ..