Just got a '99 360 F1 and dont know much about them. Under hard acceleration the car suddenly stops purring and starts screaming. Almost sounds like something opens up in the exhaust. Does the car have a valve in the exhaust that opens at a certain RPM like the z06? If so, is it possible to always keep it open, and is it a good idea? Any help will be much appreciated.

P.S. The car has what appears to look like a regular stock exhaust.

 

Yeah, there are valves in the exhaust. Variable valve timing also makes the sound change.


Good call Greg, Im dumb!

 

The 360's have valves on both sides of the muffler. They open at somewhat above 1,500 RPM.

They are controlled by vacuum and there are only two purposes for them:

a) To keep the SPL's (noise level) down near idle so the car can pass most state's noise limits

b) to recycle gasses w/in the muffler so they burn more completely at low RPM's.

You can remove the vacuum hoses to them and plug the hoses with golf tee's so the valves stay open all the time.

Then you will then notice the high sound output at all times.

 

If you drive in an area with a lot of traffic, plugging the valves can be grueling on the ears after 15-20 minutes.

 

Not for me

 

It can be but it's worse with a toobee muffler!

 

Just unplugged the vacuum lines. Car sounds AWESOME. No need to spend $5k on exhaust. Thanks a lot for your help. Much appreciated!!!

 

Absolutely.

Remember that after it fully warms it will get a bit louder but who cares?

You will have to come by sometime to show me the car.

 

My toobee exhaust creates the most amazing sound i have ever heard a car produce

I'm a huge advocate for tubi exhaust for the 360!

 

What if I get rid of the stock muffler and just install a straight pipe from the cat to the tip? Has anyone done it? Or heard it? Good idea, bad idea?

P.S. I like loud and tend to straight pipe everything I get.

 

Very bad idea:

1) extremely noisey and terrible resonanvces w/in vehicle
2) you gain nothing by removing cats-you are a polluter.

If you install 200 cell high flow cats you are w/in state regs for emissions, your engine compartment will stay cooler, and you sound level and midband performance will increase.

 

I don't want to remove the cats. I already have the high flow cats. What I was asking is if it a good idea to eliminate the muffler?

 

I don't thnik you could stand the noise!

If it were front engined the exhaust tubing itself would offer a silencing effect to some extent but it still would be loud.

Removing the muffler in a 360 would be a bit deafening!

 

please dont butcher a ferrari..... They sound so great and it sounds like you just want to make it annoying and to loud

 

Well stated.