whoosh downpipe fitting tips and hardware explained

OK guys

I wanted to clear up a few things that have been asked about the currently available catless 3" downpipe and the soon to be released catted 3" downpipe

the included hardware and how it's used....

Pic #1 all included hardware

the majority of the questions revolve around the fitment at the exhaust connection

- This downpipe is a true 3" downpipe from the turbo flange to the exhaust connection. We supply you with options to use it for ANY exhaust.
see the following pics



Pic #2

If you have a true 3" exhaust such as cp-e or Injen or even Thermal R&D with the upcoming Thermal 3" adapter all you will need to use is the supplied 3" exhaust gasket and bolts to connect the downpipe to the exhaust. You could also use this arrangement for 2.75" exhausts like the Tsudo or similar.



Pic #3 and Pic #4

If you have a 2.5" system like COBB or many other systems or even a stock exhaust you will use the supplied "ring" for proper sealing and fitment. The inside diameter of the ring is 2.5".
Once you place the sealing ring in the recess of the downpipe, place the gasket on top, then seal against the flange of the exhaust with the supplied hardware.




The remaining nut/bolt is supplied for the support bracket

Let me know if there are any questions



-Ron

I bought a plm witch looks exactly like yours. How much would you charge me for the support bracket bolt and 3 inch 2 hole gasket?

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It's close to PLM but certainly not. PLM has a separate 90 degree piece coming off the downpipe where mine is 1 piece all the way to the flex section.
Plus I'm pretty sure the whoosh is more affordable & I ship same day with the exception of stocking out over Black Friday / Cyber Monday
I have near 100 again in stock sooooo, good-to-go again!

anyway, PM me your email address. I'll set up a shopping cart and send it over. You pay shipping only, the bolt and gasket are on me my friend.

-Ron

Will do! Thanks alot Ron. Would have bought yours but I got mine like 9 months ago.

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What are the chances of getting that ring made with a 2.75” ID for a smooth transition to something like the Milltek non-res race?

should be able to use no adapter for a 1/4" difference
our exhaust dropping before November will be 2.75" as well

I would like to add my own experience for those who are planning to mate this with their stock catback system like I did yesterday, because after I got my car apart and my stock downpipe removed I realized it's a little more confusing (at least it was to me) than the info I could find online and it caused a bit of a panic at first, and it's still not 100% clear to me if how I installed it is proper. Perhaps Ron or others can give some additional feedback.

Ron sells a 3" to 2.5" (and stock exhaust) downpipe adapter for this application. Here's my conversation with Ron when I asked if the adapter is necessary when attaching to the stock catback.

Based on this I decided to forego the adapter piece.

When we (my friend and I) got the OEM downpipe off (a real PITA) and lined up the new one, I noticed that the provided exhaust gasket does not line up with the flange of the stock catback and doesn't look like it'll make a seal, which, admittedly, should have been expected, except that I assumed based on my convo with Ron and the limited info on the product description that it would fit both a 3" exhaust flange and a 2.5" flange. The info Ron provides in this thread above also seems to imply that the provided gasket will work fine when he says:




As you can see from the photo above, the gasket doesn't line up with the flange. Obviously a major exhaust leak would occur installing this way.

So then the question came, are we supposed to use the OEM gasket instead? Or are we supposed to use BOTH gaskets? In Ron's statement, its not clear whether he's referring to using the supplied gasket or OEM gasket or both. Well the problem here is that the OEM gasket alone is too thin to cover the supplied adapter ring. (Sorry no pic).

We considered using both gaskets along with the included adapter ring, with the supplied gasket against the adapter ring and the OEM gasket against the stock catback flange. This didn't seem like it would work properly and I was very skeptical of this. The outside diameter of the OEM gasket is barely wide enough to cover the inside diameter of the supplied gasket, which would cause a leak. There's just not enough overlap to be confident in this. (Sorry no pic)

In a bit of a panic I had tried reaching out to Ron, thankfully in emails he provides his cellphone number in his signature, so I tried calling and then texted, he didn't get back to me right away until after we put the car back together.

DECISION: We noticed that the provided adapter ring, when mounted in the Whoosh catback, sits just slightly thicker than the 3" flange and isn't flush. We figured this is to allow it to make a seal by "crushing" the metal adapter ring against the whoosh 3" flange and so we decided our most likely best course of action was to use the adapter ring against the downpipe and use ONLY use the OEM gasket and bolted the catback and downpipe together. (Sorry no pic again! Ugh.)

RESULT: Drove the car home last night and everything seems good so far with this setup (used the provided adapter ring with the OEM gasket, did not use the provided gasket). So far, doesn't seem like there's any exhaust leak, no codes, etc, car feels and sounds great.

It was a Saturday afternoon and I'm sure he was busy having a life but Ron did get back to me just a half hour after I completed the install and he texted me this:
So I'm really not sure what's best way, I assume that given Ron's vast experience compared to my limit experience that his way is probably correct. However I'm still very skeptical that the two gaskets used together would provide a good seal and so far using just the OEM gasket and crushing the adapter ring is holding up fine (only drove 1 hour so far though). It's too early to text him this morning but later today I'm going to text him back and see his thoughts on using only the OEM gasket.

I'll probably be picking up and installing the 3" to 2.5" adapter eventually. I'll see how the OEM gasket and adapter "crush" ring holds up in the meantime. If an exhaust leak here does occur the worst that will happen is it'll sound terrible and maybe the car won't drive quite as well until I fix it, and replacing this part is very easy compared to the rest of the install!

Thanks to Ron for getting back to me as quickly as he did and also thanks to Jason at Dizzy Tuning for being available on a Saturday in my panic to help answer questions based on his experience even though it's not his product.

Hopefully my experience will help others planning to install Ron's downpipe to OEM catback avoid any headaches or consternation. His product looks great, the sound difference is modest but noticeable and I love it, and also at $300 - $340 for a new high flow catted downpipe you really can't beat that price!

Anybody used or tested this with a cobb exhaust? I'm curious if I'd need a separate adapter besides what's included.

Also, I'm looking into this to replace a busted cobb dp. It goes down to 2.5 after the flex to match the cobb exhaust. I reckon the biggest difference is that the diameter goes from 3" to 2.5" a few inches further down the line, instead of right before the exhaust connection like with the Cobb dp.

Edit: I mentioned that and forgot why: I wanted to ask if it will run poorly until retuned? Planning on taking it in for some bigger maintenance stuff like timing belt at least, and wondering if I should get it retuned because of this slightly different downpipe BEFORE taking it to the mechanic, or after, or if it's even a big deal at all.

Also, fixed typo above, 2.5" not 2"