Last week I received a call from my friend Geoff Peters. "I want to you to do some surgery on my exhaust's" He had just been reading David Bell's story on the Space city Panteras website on how to cut the guts out of a GTS exhaust. Geoff was never happy with the sound of the standard system and his car does have a 427 DART windsor, so would certainly benefit from a free flowing exhaust.

Until I saw David Bell's pictures, I had no idea quite how restrictive the GTS exhaust boxes where.
My own Pantera has factory group 3 exhausts. These where on the car when I bought it in 1994.
They look identical externally, but on the inside the inlet pipe simply branches into two, and flows straight through with no restriction. I can see this by sticking a probe torch down the tail pipe. This is basically what I have done to Geoff's exhaust, with the exception that I used straight pipe without all the holes.

In the summer of 2002 my friend Tommy Todak (Orange County CA) and I drove my old 1981 Alfa Spider over to France for the Le mans 24 hour. After the race we spent the next 2 weeks driving up over the Alps through Switzerland and down into Italy. On the way back we stopped in at the De Tomaso factory so that Tom could pick up some new exhausts. The men in the spares department where trying to explain the difference between the two types of exhaust box. At that time we didn't know the group 3 exhaust existed (even though I had them on my car)! We spoke no Italian, and they spoke no English. Tom ended up buying the GTS boxes, not realising the other ones where group 3, and much more free flowing and louder..
We should have known what Boom Boom meant, that's the same in any language.

Johnny

Thats some nice work, let us know how they sound after installation.

Excellent pictures Johnny. Thanks for sharing! How about posting a wav or mp3 file of the exhaust?

Thanks!

Mark, Garth,

I will let you know how it sounds. I like um loud, but this may be too loud.. I will record the sound with my camera, but will need advice on how to upload it.

Johnny

Johnny,

the photo "how to" is always appreciated, thank you.

that would be too loud for me!

You should be able to post a sound file (MP3, WMV, etc). That's a new feature of groupee, I'll enable it for this forum.

George

Thanks George,

It will be a few weeks before I get the exhaust back on, I will try the sound file then.

Johnny

I've done the same on my mufflers. I also increased the tailpipes to 2 1/2 inch. The originals cost me 50 rwhp.
Loud? Yes. Very loud.
A little too much on long trips, but maybe I'm getting old.
Will D.

Johnny,

Have you got your exhaust back on yet? If so, How does it sound compared to before the mod? Do you think there will be a significant difference between your "straight pipe" method and Dave Bell's "gutting the inside" method? I know that both of these will be louder than the stock GTS. I'm trying to determine which method of gutting I will do.

thanx,

John (soon to start gutting) Maffeo
#2647

Hi John,

I am going to my friends house this weekend to refit the exhaust. I will record the sound with my camera and try to upload it here. So hold on before you start gutting!

Johnny

Hi John,

I am going to my friends house this weekend to refit the exhaust. I will record the sound with my camera and try to upload it here. So hold on before you start gutting!

Johnny