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Engine Specific Info and Questions => IDI Engine => Topic started by: veeman on September 21, 2005, 08:45:51 am

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: veeman on September 21, 2005, 08:45:51 am

I'm trying to help out someone locally that's swapping a TD into an A1.  Basically, he's trying to find an answer on whether or not he can use his NA exhaust downpipe  to connect to a cast A1 TD turbo downpipe  (both clip types).  

Has anyone ever tried this combo?  I happen to have both types of exhaust downpipes on hand, so I took some pics.

It appears that the TD downpipe is indeed shorter overall than the NA unit and as a consequence, it has a different, sharper bend where it goes into the tunnel.

(http://www.hostdub.com/albums/veeman_album07/TD_downpipe.jpg) (http://www.hostdub.com/veeman_album07:TD_downpipe)

Here's a shot of them side by side and then stacked.  You can see the difference in height and angles...

(http://www.hostdub.com/albums/veeman_album07/TD_downpipe2.jpg) (http://www.hostdub.com/veeman_album07:TD_downpipe2)


(http://www.hostdub.com/albums/veeman_album07/TD_downpipe3.jpg) (http://www.hostdub.com/veeman_album07:TD_downpipe3)


So... the question is, can he use his NA downpipe (like the one above) with the stock A1 TD cast iron downpipe.   I'm thinking it might be possible, but since the NA downpipe is longer / higher, he might have to see if it shifts the whole exhaust down below the car and stresses out the hangers.  It'd be simple to do since the whole thing just clips onto the cast piece.

I couldn't really tell if the "bowl" part and clips were the same, but they appeared to be similar.

Another option might be using the stock NA exhaust downpipe pictured with a short section removed.   I bet if you removed about 1.5" or so from the "neck" of the NA pipe then rewelded it, it'd work just fine.    

Does anyone have any info?  I'd let him use my TD downpipe, but it appears to be fused to the stainless exhaust I got with my engine.

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: vwmike on September 21, 2005, 10:36:10 am

It doesn't look to me like it'd work, but if he wants to run an OE
downpipe they can be had new for about $50.

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: veeman on September 21, 2005, 10:39:00 am

Is that from the dealer?  I had no idea things like that were still available...

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: vwmike on September 21, 2005, 10:43:05 am

It may very well be aftermarket. Go and plug the part number into http://www.1stvwparts.com. That site is for a dealership - Auburn VW (Auburn Washington). I have seen no cheaper place for dealer specific stuff.

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: vwmike on September 21, 2005, 10:56:09 am

171253091c - $46.08

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: veeman on September 21, 2005, 01:26:52 pm

That's another great idea.  I'm assuming that if you use a bigger diameter (2.25" or so), it'll simply adapt right up to the conical "bowl" piece, right?

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: Maarten on September 21, 2005, 01:58:56 pm

just cut off the toiletbowl and cut som more of till the hole in the bowl is the size of your exhaust (mine = 60mm) and weld it together...

I bought some 90 degree exhaustbends at the local hardware or autoparrtstore, cost 12 euros a piece :)

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: bryanbryan89x on November 03, 2005, 08:27:21 am

what if you were to use 3 inch(76mm)???

Title: A1 NA exhaust downpipe with TD turbo downpipe?
Post by: 935racer on November 03, 2005, 08:48:28 am

Why not use the new passenger performance mk1 2.5'' dp and eliminate the crappy toilet bowl system. Give a good excuse to make a 2.5 straight through exhaust system!