Aftermarket manifolds on but still not happy

Interesting...I have capristo headers with the twin sound exhaust. I love the sound but it is loud.
I leave the valves open because I don't like the tone with the valves closed.
On the taurino website it says the valveless race exhaust is louder than the twin sound.
It would be nice to have some objective do levels to go by.

 

Correction on my post above in the last sentence;
It would be nice to have some decibel levels to compare.
For example capristo headers with twin sound valves open versus capris to headers with valveless race exaust muffler.

 

Agree with your comments...

I too, have Capristo headers and the Twin Sound Exhaust. I installed the Capristo system when I replaced the old Mk1 manifolds. I find that with the valves open, the car is loud, perhaps too loud for my conservative tastes, especially with a spider. With the valves closed, it isn't significantly different than my old set up with Mk1 manifolds but with a Tubi exhaust. I have OEM cats with both set ups....

I'm curious whether an OEM muffler/canister will quiet things down a notch or two?

Cheers
FN

 

I recently changed my OEM Mrk 1 headers to AP headers on a spider as a preventative measure (my headers are not cracked) and was equally surprised at how loud it is. First time I drove full-throttle through a tunnel I almost deafened myself!

But when you think about it, with the valves open there is no muffler other than the cats - I'm surprised how much of a difference the pre-cat makes on the standard header - both should be extremely loud.

I agree it's very anti-social in town when the valves open, so I tend to just drive the car in the wet setting so they don't open till over 4k which isn't very often cruising about. When they are closed the car is still 'noticeable' but not really antisocial IMHO.

Ideally, replacing the valve control with an 'on/off' switch would solve the problem for me (as in wired in, not a remote control keyfob) when the valves are closed the sound is reasonable - a Ferrari should never be silent

I've heard the problem with the OEM headers (esp the mrk 1) is that the pipework itself is too thin, so welding them up may just cause stress failures elsewhere, hence I'm keeping the aftermarket headers on the car. sadly, it does mean trackdays will be an issue - perhaps donnington 'loud' days and Silverstone days will still be ok... Spa is always an option as their noise limits are pretty high.

 

This is disturbing news. I have the 2nd generation manifolds. They were installed 5 years ago. I was going to replace them with aftermarket headers as a preventive measure but I don't want it much, if any, louder than it is now.

Taurino racing is nearby. I will consult them before I do anything.

 

I replaced my auto button with a manual switch for exhaust valve.
Image Unavailable, Please Login

 

People here with AP headers... Is anyone running blankets? My mechanic seems to believe that running insulation blankets will help reduce the sound marginally. Any thoughts?

 

I'm considering getting the Forza kit and leaving the valves closed at all times.

 

Just want to share the update after installed the Capristo Race system (non valves) along with the aftermarket headers.

- The idling up to 2500rpm is slightly louder than OEM muffler with aftermarket headers.
- Above 2500rpm. Capristo has much better and pleasant pitch than OEM with valves open. Everyone was complimenting the beauty of the sound in the out last Ferrari meet.

Overall I'm very happy with the changes.... The OEM muffler valves open with headers is just became ridiculous and anti-social. The Capristo Race doesn't have bypass valves means the gas has to go thru the muffler at all rev to refine the pitch unlike the OEM or Capristo Twin sound that the gas goes straight out from cats .

 

Sounds like you found a good solution. If there is any way you could take a quick cell phone video, I think many of us would be very interested to hear how your new setup sounds.

 

Agreed!

 

The key here is that both sides are joined either through an X-pipe or a muffler.

 

So this is not unbearably loud? I have a spider and am thinking of making an exhaust change later this year. I can't/won't have my car obnoxiously loud. So you went with Capristo headers?

 

I don't know the brand of the header (installed by previous owner)... probably agency power or fabspeed...

 

But it's not too loud for you? I want something maybe a bit louder than stock. Maybe. I hate loud obnoxious cars. Or motorcycles.

 

That's where I'm at too.

 

I agree, the volume level from stock is just about right, but a bit louder could be good too, maybe around the same volume level as the Scud.

Overall I think a car should sound natural and as it was intended to. Any car can be made to sound obnoxiously loud, but it normally just looks ridiculous and like somebody is looking for attention.

I still am shocked that just changing out the headers, and not even touching the exhaust, makes the 430 so obnoxiously loud!

 

Have you considered the Capristo race system without valves that Abyss mentioned above? It sounds like he was happy with that and was also running the AP headers like you.

It seems the big problem with AP headers and the stock muffler being too loud is once the valves open, but it sounds like the Capristo no valve muffler would help with that.

 

I completely agree with you, if possible stock is definitely the way to go.

Are you going to go back to your repaired MK2s? Any concern at all if they will hold up? How about risk of potential engine damage if they fail?

Just curious of your thoughts as I think repairing OEM manifolds is a new idea, but certainly a very interesting one!

 

Stock sounds to docile . Mustang GT sounds better from the factory