S3 Downpipe to Stock Catback

[HansfishS3]

Hi all,

Managed to get hold of a 3" downpipe and sports cat ... looking to fit this to the standard catback (2.5" I believe?) do I just need a 3" to 2.5" reducer?

Is it also worth changing the turbo gaskets/bolts?

 

[mjr901]

Just change the turbo gasket

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[HansfishS3]

Okay thanks, trying to figure out how to join it to normal catback....sorry not clued up on exhausts

 

[mjr901]

Oh and for that, yes you will need a reducer.

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[HansfishS3]

Would this need to be welded in? Wondering if I can fit on driveway or easier to take to an exhaust place...the system was originally twinned to a miltek catback

 

[mjr901]

No welding necessary. Just a reducing sleeve and clamps.
If im honest messing around with an exhaust on a driveway isnt fun and if it were me, find a ramp or give it to an exhaust place or workshop to put on.

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[HansfishS3]

Thanks Mike ...parts request for a new turbo gasket will be opened...still struggling to find exact reducer and clamps I need, could someone post a link?

 

[HansfishS3]

Heres the DP in question...ignore the decat thats bolted to the sports cat for shipping purposes only

 

[HansfishS3]

How has everyone else managed this?

 

[kash_v]

Is that a custom made downpipe/cat?

I have a cobra downpipe/sports cat ready to go on, just need to order a reducer from them

 

[HansfishS3]

Its made by RPC motorsport, was originally mated to a miltek catback

 

[HansfishS3]

Forgot to mention the center section seen in the pic is Miltek

 

[kash_v]

From that pic, I don't think that's easily mateable to an oem system. Best bet is take it to a exhaust shop.

 

[HansfishS3]

Right okay, what makes you say that? Are there any obvious differences between this and say the bcs fitment to stock catback?

 

[HansfishS3]

Managed to sort Took it to a custom exhaust place, they welded a reducer ...so now its 3" all the way till the first backbox. Sounds so much better without being droney and feels a bit more punchier aswell

 

[HansfishS3]

Right guys after driving for a few days I've noticed that in certain cases (engine braking) the downpipe is touching the car causing a vibration throughout the cabin. Would changing the dogbone mount bushes help with this? Doesn't seem to happen under hard acceleration...there's not much wiggle room in there!

 

[prt57]

The Powerflex bush will help with this as it reduces engine rock.

 

[HansfishS3]

Okay thanks, would it be best changing the bushes and the insert? Could anyone post a link of where best to buy from?

 

[prt57]

Most folks change the insert. At BCS exhausts you have the option to buy the yellow insert.
You need to decide which version suits your car from here:

http://www.powerflexshop.com/car/audi/a3-mk2-8p-2003

After selecting the correct version, order on eBay.
Be aware that the bolt holding it all together is a one use stretch bolt.
See the ECS video to watch how it is done.