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Old 12-05-2017, 03:49 AM   #1
Bready
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Default 2001 C70 Downpipe replacement

Need to replace my downpipe with cat - suggestions? Figure as long as I'm at it I should opt for a 3" performance set up since the difference between the OEM and that is a few hundred dollars.

Thoughts on the best option out there?

Thanks
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Old 12-05-2017, 11:27 AM   #2
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If you can find the OBX stuff, the ones I've seen and had on the R were nicely done.

CJ (yother.com)may still be making them as well, little on the spendy side but really nicely done.
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Old 12-05-2017, 12:08 PM   #3
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OBX doesn't sell their downpipes separately, it's a full turboback setup. If that's what you want, fitment/quality is decent for the price, and the full OBX setup does drone while cruising. You can find the downpipes separately in the classifieds/CL for around $150, but you'll need to do something to mate it up with the stock exhaust.

As mentioned in the post above mine, CJ, IPD and a couple others have nicer, but more expensive options
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Old 12-05-2017, 03:55 PM   #4
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I wonder if the one from an 850 would fit the chassis? My brother has an OBX, I think its angle flanged. But I think it might be catless...
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Old 12-05-2017, 04:07 PM   #5
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What I saw on the OBX site seemed built for the inline 6 NA motors - am I missing something?
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Old 12-05-2017, 04:07 PM   #6
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Quote:
Originally Posted by GTJordan View Post
I wonder if the one from an 850 would fit the chassis? My brother has an OBX, I think its angle flanged. But I think it might be catless...
Thanks Jordan.

Ya didn't think of that - I need a cat.

What's the OEM price like?
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Old 12-05-2017, 04:32 PM   #7
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Quote:
Originally Posted by Bready View Post
Thanks Jordan.

Ya didn't think of that - I need a cat.

What's the OEM price like?
They're expensive new. Tasca can sometimes even beat my cost on stuff here. They list it at 950USD.

Jordan
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Old 12-05-2017, 04:38 PM   #8
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https://www.ebay.com/itm/3-Inch-Turb...VaHdRu&vxp=mtr

We put one of these on Scotty's Yellow...
https://www.ebay.com/itm/Maximizer-B...ZUNBjm&vxp=mtr

Definitely did drone a little at certain rpm ranges with that muffler, fit was decent. Swap in a better muffler and call it good, especially for the price.
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Old 12-06-2017, 01:16 PM   #9
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As long as it's angle flange, anything from the P80 line will work (all 850 and s/v/c70 1st gen).

You can also make a P2 downpipe work if you have access to a welder or exhaust shop.
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Old 12-06-2017, 02:07 PM   #10
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Can't beat the value you get for an OBX turbo back system, it comes with two downpipes, one for a straight and one for an angled turbo housing.

I'm pretty sure your 2001 s70 would be a straight angle on the turbo exhaust housing, also check if your car has the SAS bull****, which connects to the downpipe to pump air during cold start to warm up the cat, not sure if the 2001 have that but my 1998 does.

The OBX exhaust doesn't have a cat, although there is a spot for the rear o2 sensor, so a spacer may be required if you don't run a cat. Does WA require a cat or have some kind of inspection ?
Otherwise I'd find a 3" high flo cat with an o2 bung and weld that on to the pipe after the downpipe?

In BC we scrapped our "aircare" programme so i'm going to be running the OBX exhaust with an SAS delete, and rear o2 delete and will probably replace the OBX muffler with a Dynomax.
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Old 12-06-2017, 04:59 PM   #11
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Pretty sure Bready's should be the 'flat' flange not the angled flange. That said, Bready, if you find an angled flange DP, get the housing, swap onto your current turbo. Really did notice a difference on the R with the DP and angled housing upgrade. Roughly 3/8" larger ID on the housing compared to the flat flange housing.

Amar is right, check for the air injection. I don't recall if those still have AIR or not, Gwen's did not, but it was before the AIR craze of 98. lol
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Old 12-07-2017, 04:51 AM   #12
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lol by straight angle i meant flat flange. There are two types of angled flange turbine housings as well - one is 6cm^2, and the more desirable one is 7cm^2.
The larger one does flow quite a bit better than the flat or conical housings.


above image shows a straight flange vs angle flange turbo. Yours is most likely a straight flange.

SAS is easy to spot but I have no experience with the 99+/ME7 stuff or whether them models have it or not:
http://volvospeed.com/volvo_repairs_...placement.html
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Old 12-07-2017, 10:25 AM   #13
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O1 c70 would have an angle flange. Get the obx kit or down pipe and buy an aftermarket cat.
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Old 12-07-2017, 06:47 PM   #14
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OBX doesn't make the turbo exhaust anymore, so only place to find is a random place that still has some stock.

And as stated, OBX kit doesn't have a cat. Same chassis for 850 to 2004 c70 so anything that fits fwd 850 fits fwd c70 with regards to angle or straight flange turbo which is only difference.

I have the OBX kit in my S70 T5M and I kinda think it's on the quiet side. Sounds great at full throttle but a bit quiet with any throttle less than full. Build and fitment are pretty good compared to the price. Rear muffler pipe hits my IPD rear sway bar though I'll blame IPD because their bar doesn't have an angle built in like the oe bar has.

Also for anyone running no cat- I've had good success leaving the rear O2 out of the system. Plug the rear bung and zip tie the rear O2 up out of the way but leave the electrics plugged in. Rear o2 is looking for oxygen to say if cat is good or whether secondary air is needed. If sensor is out of exhaust stream it sees lots of air. I've not had and cat or sas check engine lights yet. Just a thought.
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Old 12-07-2017, 07:01 PM   #15
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Exhaust kits are still available on ebay but the prices have gone up exponentially! I found this kit still for a reasonable price. https://www.ebay.com/itm/Maximizer-B...ZUNBjm&vxp=mtr

Do a quick search on ebay. https://www.ebay.com/sch/i.html?_odk...t+obx&_sacat=0
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Old 12-07-2017, 08:03 PM   #16
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Quote:
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Exhaust kits are still available on ebay but the prices have gone up exponentially! I found this kit still for a reasonable price. https://www.ebay.com/itm/Maximizer-B...ZUNBjm&vxp=mtr

Do a quick search on ebay. https://www.ebay.com/sch/i.html?_odk...t+obx&_sacat=0
Wonder if that black kit is stainless or not?

Prices will continue to rise since they're not made any more. The turbo back kit isn't listed at all on their website. That being said, I paid $350 shipped just three years ago!
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Old 12-07-2017, 08:47 PM   #17
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Wonder if that black kit is stainless or not?

Prices will continue to rise since they're not made any more. The turbo back kit isn't listed at all on their website. That being said, I paid $350 shipped just three years ago!
Maximizer is mild steel. Maybe OBX won't make their system anymore but the Maximizer off brand has upped their offerings. I'm still surprised they offer something for 7/9 series car and nothing for 240s. You can still get a Simons kit from overseas.
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Old 12-07-2017, 10:39 PM   #18
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That Maximiser we installed looked identical to the OBX, other than the difference in materials and the paint.
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Old 12-08-2017, 01:17 AM   #19
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I've wondered if this place has stock:
https://www.sparktecmotorsports.com/ex11111.html

I bought their $65 OBX strut brace but the next day they cancelled the order and refunded me stating it was not in stock. Seems they're pretty bad with what their website shows as available or in stock.

anyone have issue with the p80 sedan fitment of the OBX exhaust? With the tip sticking out an extra couple inches?

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Old 12-08-2017, 08:51 AM   #20
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The OBX on our 850 does stick out an inch or two further than it should.
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Old 12-08-2017, 12:00 PM   #21
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On ME7 cars you can't just leave the rear o2 out of the exhaust, you'll throw the code. It senses temp and o2 so if it's not hot it knows it's out of the exhaust. It just needs to sense less o2 than the front one so in a catless system an extender or right angle fitting will allow it to get hot and still read less o2 to avoid throwing a code. Or you can have it deleted by a tuner.

If you want an aftermarket cat, this one passes emissions in Denver, which does the sniffer test and is fairly strict. I have the IPD exhaust and this is what's in it: https://www.amazon.com/dp/B00FG9ORRM...O78WZFQ5&psc=0
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Old 12-08-2017, 12:16 PM   #22
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I've wondered if this place has stock:
https://www.sparktecmotorsports.com/ex11111.html
This is where I got my kit a few years ago for dirt cheap.
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Old 12-08-2017, 12:19 PM   #23
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Originally Posted by LloydDobler View Post
On ME7 cars you can't just leave the rear o2 out of the exhaust, you'll throw the code. It senses temp and o2 so if it's not hot it knows it's out of the exhaust. It just needs to sense less o2 than the front one so in a catless system an extender or right angle fitting will allow it to get hot and still read less o2 to avoid throwing a code. Or you can have it deleted by a tuner.
Ahh gotcha! Did not know it sensed heat. I know They need to get hot quickly but wasn't aware it was looking for heat. Wonder if it could be wire tied to the exhaust or near the turbo and get that heat not that it really matters though.
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Old 12-11-2017, 12:14 AM   #24
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Quote:
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The OBX on our 850 does stick out an inch or two further than it should.
The tip stuck out too far on my 850 as well. I suppose that could easily be fixed. I also thought it was worthwhile to upgrade the v-band clamps.
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Old 12-11-2017, 12:15 AM   #25
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I think Scotty's may have stuck out a bit as well, before we trimmed it, been a few years since we installed it though.
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