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Why a catback makes sense for 94-00 850/S70/V70's

How to go faster, stop quicker, and turn harder. Chips, exhaust, larger turbos, bigger/slotted/drilled rotors, high performance brake pads, manual boost controllers, performance shocks/struts/springs, airbox mods and more! Also discussion on HID and Xenon lights, aftermarket foglights and other exterior lighting.
northernlights
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Year and Model: 850 Turbo 1994
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northernlights

Why a catback makes sense for 94-00 850/S70/V70's

Post by northernlights » Wed Feb 19, 2014 8:26 pm

After installing a 2 1/2" Simons catback (of which the quality was outstanding) I did a post-mortem on the 20 year old factory exhaust on my 94 850 Turbo. I was amazed how flat the factory pipe was where it passed over the rear suspension. I have attached some comparison shots with a standard 2 1/2" ID/OD exhaust bushing next to the exhaust pipe that was the stock muffler outlet.

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This is a inside picture of the stock pipe vs the 2 1/2" OD part of the bushing. It's one thing to know that the flow area increased, but it's another thing to see it.

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Ben850
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Ben850

Re: Why a catback makes sense for 94-00 850/S70/V70's

Post by Ben850 » Sat Feb 22, 2014 4:20 pm

Flattening should not reduce flow.
Tight bends that are not smoothly mandrel bent will hinder flow.

Is the Simons system loud and/or drone-some?

I like the stock growl of my turbo. I will be adding 3" intake flow with an R ECU so I may also be looking for an exhaust that is still quiet, but flows well. (sleeper)
1993 850 GLT , You wouldn't know it.
1996 850 Turbo Wagon White.
1995 T-5R Black. New work in progress.
1998 V70 XC Cross Country White.
1994 850 N/A Wagon Black.
1997 850 Sedan Black.
1996 850R Wagon White.
1997 850 Sedan Red ( not white or black!)

northernlights
Posts: 250
Joined: Fri Oct 12, 2012 10:49 pm
Year and Model: 850 Turbo 1994
Location: Florida and/or Raleigh NC, depending on the day
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northernlights

Re: Why a catback makes sense for 94-00 850/S70/V70's

Post by northernlights » Sun Feb 23, 2014 8:49 pm

You are absolutely correct in that a reasonable amount of flattening is probably not the end of the world, but...it is always a reduction in cross-sectional area relative to a circle. That's geometry.

I think the sound of the Simons is great, and everything bolted together without drama. The tone is very low, which seems to be the opposite of what most of the stuff out there delivers. It's actually more quiet than I expected. I don't think it drones on the road, at least not enough to bother me, but it does have a low semi-rumble at idle. If I can produce a good sound clip, I will post it.

I bought the 020-H7 version, which has two mufflers. Both mufflers are straight through designs (one may look through them) so the flow restriction should be minimal, or at least less than stock. The car seems more reponsive, but I won't know for certain until the next track day.

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TME sells something that looks very similar, and they claim a 78% reduction in backpressure. I suspect Simons (aka Ray Metallfabrik AB) makes all of these systems, so the ultimate performance is probably similar, but some are shinier than others - 304 (TME) vs 409 (Simons) stainless in this case.

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northernlights
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Joined: Fri Oct 12, 2012 10:49 pm
Year and Model: 850 Turbo 1994
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northernlights

Re: Why a catback makes sense for 94-00 850/S70/V70's

Post by northernlights » Mon Feb 24, 2014 2:16 pm


northernlights
Posts: 250
Joined: Fri Oct 12, 2012 10:49 pm
Year and Model: 850 Turbo 1994
Location: Florida and/or Raleigh NC, depending on the day
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northernlights

Re: Why a catback makes sense for 94-00 850/S70/V70's

Post by northernlights » Mon Feb 24, 2014 2:24 pm

And a few pics of the parts...

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