ew928

Think Sias from TN had the Cloutier 'snake nest' exhaust system a few years back. Waay back when on an champagne/gold 928S.
It sounded pretty wicked at SITM.

Those convoluted pipes would need a good fabricator and some awesome jigs to set up to line up properly, I guess.

jon928se

Only louder if installing the X means removing the factory cats. I think, if all I have read is correct that adding an X into an otherwise unchanged system (Not possible if you have a factory system to start from) will actually make it quieter.

largecar379

slightly louder if you remove the CATS. Deeper? usually not. for a deeper tone, you would need to increase the diameter of the pipe throughout the whole system (ex: go from 2 inch pipe to 2.5 or 3 inch)

other modifications that would help are switching to a full dual exhaust system (if yours is currently a single pipe), switching to high flow CATs, switching to modern high flow mufflers, and removal of the rear muffler.

--Russ

Mongo

I know someone above was mentioning F1 sounds from exhaust systems. Perhaps someone could create a custom exhaust system inspired by a company called Kreissieg.

Kriessieg ( www.kreissieg-usa.com ) creates exhaust systems with an electronic/vacuum operated solenoid that opens up a bypass that allows the exhaust to escape around the muffler, while going through it at the same time. The result is a very high high pitched shriek that sounds much like a Formula 1 car.

Here's a sample of what some Ferrari's and Lamborghinis sound like with them.

Bill51sdr

sunovabeech!!! Both those cars sent chills up my spine. DAYUM!

Daniel Dudley

I have been thinking about this F1 sound thing, and my 911 with headers and a pretty open exhaust had a trumpet like tuned sound, especially at full bore in the upper revs. Same with the supecharged Miata - trumpet like in the upper revs, maybe a little more gruff.

I can't say I ever heard a sound like that on a 928. The best ones I ever heard were like a NASCAR sound track or the V8 gargling through a large sewer pipe sound. That is the sound that would be closest to the trumpet like wail, except that it is a baritone horn. I like the muted NASCAR sound myself.

sty3x

Yeah that would be me who said about them they sound so sexy with those exhausts any idea of how to get something like that but on a 928??

Charley B

I guess I must be a little sick. I actually enjoyed the diversion, keeping an exhaust thread from becoming terminally boring.

Not to mention the fact that one of them is making a pretty good, and overdue, point.

svp928

Sterling, those are definitely 180 degree headers, and they probably come the closest to sounding like a flat-crank V-8. Were they on your car before you did the Anderson header mod? Did you like them?

By the way, your car is really nice now that you have back from the body shop..!!

6mil928

I think I pitched a tent

Mongo

BTW, I don't think that Lamborghini Countach has a flat plane crank, and neither does the Diablo. Yet, Kriessieg can make them sound like they do with just a bypassing solenoid. I've attached a picture of a 360 Modena exhaust designed by Kreissieg. Ferrari's 360 engine DOES NOT sound like an F1 car with the factory exhaust, or a Tubi. It does however with a Capristo or Kreissieg using a special bypass valve (Kreissieg and Capristo) and baffles (Capristo only).

To get an F1 sound out of a 928 is going to be difficult, but it is possible through specially designed exhaust piping.

Sterling's pictures of those headers is the key to getting the depth, but to achieve the exact F1 note like some of these Ferraris and Lamborghinis heard in the videos above, muffler bypassed piping needs to be a certain size and length.

I had an idea a while back of incorporating exhaust cut outs and piping smaller than 2" from pre-muffler to exhaust tip like the Kreissieg. It's a lot more difficult than it sounds, but can be done!

Mongo

More Kreissieg F1 exhaust sounds on Italian cars:

Mongo

Hey Sterling, where did you get those headers at?! I want a set!

Mongo

Do you remember who makes them?

svp928

Mongo, the Kreissieg systems are very interesting- it appears that they are combining two separate exhaust paths with one being about 50% longer than the other...because sound travels at a given speed, you can then create a secondary pulse between the primary pulses by making adjustments to the length of path #2, if you see what I mean...sort of. So , on our cars, you would need the 180deg headers to start with, then, after the collector, split each side off with a Y, then from the Y into an X, then the solenoids, then back to the tailpipe AFTER the muffler, and then an H between the muffler tailpipe and the bypass tailpipe on each side, making sure that the bypass side is 50% longer than the muffled side.....and it would sound like a flat-crank V-16! Or the F430 in the video...

HA! Simple, eh? Midas should be able to do it in an hour or so.....

Steve