Hi, I am looking to do a few upgrades...one of which will be an exhaust. I have a 1994 940T Wagon and want to put some sort of performance exhaust, did some looking around online and can't seem to find any ready made 'kits' Any recommendations would be great. In addition, i'll be installing Bilstein HD's and IPD 25mm sway bars front and rear. Thanks for looking...

Steve

 

There is a guy on turbobricks.com who sells 3" turbo back exhausts for just over $550. Also a local shop can do a custom exhaust.

 

I'm not sure lostartof sells exhausts for 940's

 

Is there a difference between 740 and 940 exhausts? Could always pm Mike...he is usually fairly prompt. You won't find a kit that's a substantial improvement. The main thing that has to happen is to remove restriction. The turbo itself provides all the back pressure the motor needs. So, to do it right, 3" is the answer. Mandrel bent pipe is the best; crush pipes from the exhaust shop will have a reduced interior diameter at the bends. I had Mike Brown (lostartof) do my down pipe and I bought the rest of the pieces from Summit. Even so, the cost of materials was almost $400 for pipe alone. Muffler selection is important too as is the catalytic converter. I used "bullet" style cats from eBay. $50 I think. Like this...

Mufflers will depend on how young you are! MagnaFlow turbo ovals are great and relatively quiet. $65 at Summit. Mounted it just forward of the rear axle...

I also used a 3" glass pack as a resonator behind the axle (cuz I'm old and like to stay under the radar!

Here's what the setup sounds like...
http://www.youtube.com/watch?v=jlf-7nCo8FQ

 

Thanks for the replies and the detailed pictures! going to figure out what to do this weekend.

 

OK UPDATE:
As luck would have it, the pipe leading to the rear muffler rotted away and is now not connected to the rear muffler, the pre-muffler is also leaking a bit (keep in mind that a month ago the exhaust was nice and quiet) In Sioux FAlls there is nobody who does mandrel bends/custom exhaust, though I did find a mineke shop that would put in a 3" system for me, Question is... my down pipe already looks like a 3" (it is much thicker than the cat inlet/outlet and the rest of the exhaust pipes, and looks good.) I am thinking if it is.. just replacing the cat with a larger diameter inlet/outlet and continuing with 3" piping for the remainder (if it has to have restrictions due to bending, the flow will still be better in a 3" pipe as opposed to a 2.5" or smaller pipe. I was also wondering if the pre-muffler can be eliminated altogether, what is its purpose anyway?? Any thoughts?

 

What you mean the downpipe is bigger? did a PO add it? you can see on mine the 2.5" section right off the turbo side, then 3" out.


Here is mine...

Downpipe:


High flow Cat:

 

I am not sure, but the downpipe diameter is significantly larger then the rest of the ehaust pipes. by the way, your set up looks awesome! did you order yours from that guy on turbobricks or have a local shop do a custom set up?

 

Local shop did it (Labree Motorsports)

The stock diamter is 2.5" from turbo to the cat.
If you post a pic, maybe we could know for sure.

 

The stock downpipe is pretty good, it is 2.5". The rest of a stock system is maybe 2" if it's lucky, and the stock mufflers are fairly restrictive. A 2.5" cat back system is worth 2psi of boost.
Also, the stock cat is a small restriction also a larger cat is worth about .5psi boost. And yes, my stock cat was free and unrestricted when replaced.
I'm not convinced 3" systems make a difference below 300hp and are necessary on a steet car, but there's no downside to going that size.
This is my exhaust, 2.5"

Truck muffler:

Cat I welded in a few days ago:


Regards, Andrew.

 

Hey Andrew, Thanks for the pics and advice... Looks awesome, so It appears that you just installed one muffler (where the pre-muffler was) and eliminated the rear muffler? Is that correct? Downpipe ---> Cat ---> muffler --> Tailpipe? How does it sound and what kind of muffler did they install?

 

Yes, one muffler only. It's doesn't drone, it's not offensively loud, it's probably the loud side of an average car's exhaust. Makes a nice burble idling though.
I have a generic light truck muffler as the only muffler, it's a straight through, chambered design. These mufflers are good because you can get them in large inlet/outlet sizes and flow is more important on turbocharged diesel trucks than noise suppression (although they do that well on a car). And best of all, they're cheap and readily available, plus very well made.
Truck mufflers have huge internal volumes, they suppress sound by using lots of large chambers rather than turning the gas around against baffles etc.

Regards, Andrew.