GaryJ

I am finishing up a 5L Hybrid build and am considering the exhaust. I would like to have duel exhaust out the back of the car. I know the 32V’s have a duel setup that goes into one at the back of the car but all the 16V’s I have seen go from the headers to a Y pipe and are single from there back.

Is there a specific reason that the 16V’s have to be a single pipe?

Will my plan for a duel pipe system with an X pipe work? Or better yet will I see a performance gain or drop?

Thanks for your thoughts,

Gary

Jim bailey - 928 International

The Euro S 300-310 HP had dual pipes side by side into a single rear muffler. The single pipe was big enough for the USA motors of the time..

GaryJ

Thanks Jim:

I thought it would work but I wasn't sure if there were some specific back pressure requirements for the 16V's.

Do you think one of the available 32V crossover pipes will work well?

Thanks,

Gary

Jim bailey - 928 International

Should work just fine since you will have the same 5 liter displacement and same room under the car in front of the axles .

GaryJ

Thanks again Jim,

Gary

hacker-pschorr

WIth headers the exhaust on my 79 is about as open as it gets. I lost 5hp when I closed the adjustable muffler (when open, it's 100% straight through).

Friend of mine put duel exhaust on an 84 in the same configuration as an S4.

Jim,
Wasn't the duel exhaust that went down the same path as the single using pretty small pipes? A good 3" would flow better than the ones I saw come off a car few years ago.

FlyingDog

The early dual exhaust (80-85Euro/ROW, 85-86US) that runs only on the driver's side has a rather large restriction where it goes under the rear crossmember, so the 86Euro/86.5US exhaust would be much better. A simple single 3" (and probably 2.5" with straight through muffler) will flow much better than any factory exhaust.

Lizard928

hmm never seen an exhaust duel. however I have seen dual exhaust systems.

GaryJ

I thought with the X pipe the two sides would be dueling to see which side they would exit on. I guess no more fast typing for me.

This is going to be a completely custom exhaust so I was just checking if running two pipes with a crossover leading to two different exhaust pipes would work.

Thank you all for your input.

Gary

hacker-pschorr

Gary,
What manifolds are you going to run? If you are going to do a 100% complete custom exhaust, I would at least upgrade to the 85/86 manifolds if not headers.

GaryJ

I have a set of MSDS headers.

Gary

SMTCapeCod

A search should bring forth a bunch of options and images.

Sterling G posted a nice thread with his machinist-grade uber-solution.

There is a picture of a more modest, but still decent parallel steup on the owner's club webpage from the recent Wilbraham Tech Session.

Sure I'm missing a bunch. Do add to the collection though- nice to see people getting more creative with some aspects of O&M.

largecar379

you're on the right track--no issues with 16V as far as back pressure is concerned.

if there was, my header sidepipes would be very harmful, as there is NO back pressure......

I have repeatedly suggested:

headers, crossover, dual 3 inch CATS (if required--my state does not), dual 3 inch pipes into Flowmaster 50's (3 in-3 out), dual 3 inch pipes out the rear.

there is enough room to do this on an early 928. dual muffler shields available from 928 Int'l, or me---as I have a set from them I am not going to use.

---Russ

Ian928

I think the front muffler on the 16V Euro S act like a Xpipe. The two perforated pipes in the same muffler should allow higher pressure from one side to bleed over to the other side.

GaryJ

Thanks SMT I will definitely look up those threads.

Gary