Avant Exhaust System

[Alistair E]

Well, after 21 years the original exhaust system has given up. Extremely impressed with how long it's lasted but the time has come to look for a replacement.

Looking for a catback system. Car has RS2 exhaust manifold, turbo, intercooler and injectors running with one of Paul's chips.

Went to a local exhaust place, Cybox on the Wirral, and was told they wouldn't be able to fit a 3" system but could do 2.5" with two boxes for about £280. He said it should flow better than the current system due to the boxes being less restrictive.

Sounds cheap enough but I'm looking for some advice on the possible issues in reducing diameter. Any advice gratefully received.

[jade]

Well, after 21 years the original exhaust system has given up. Extremely impressed with how long it's lasted but the time has come to look for a replacement.

Looking for a catback system. Car has RS2 exhaust manifold, turbo, intercooler and injectors running with one of Paul's chips.

Went to a local exhaust place, Cybox on the Wirral, and was told they wouldn't be able to fit a 3" system but could do 2.5" with two boxes for about £280. He said it should flow better than the current system due to the boxes being less restrictive.

Sounds cheap enough but I'm looking for some advice on the possible issues in reducing diameter. Any advice gratefully received.

B5 RS4 works well if you can find a good second hand one.... or new ?

[Alistair E]

I've had a look on ebay but can't see anything reasonably priced. Is the RS4 exhaust a straight bolt on or does it require some modification? If so, what's involved?

Does anyone have any comments regarding the pipe reduction and possible flow restrictions?

Also, anyone with a 3" system got any suggestions. I was told that the issue was getting the boxes to fit without having issues with ground clearance. I'd be interested to see photos of any systems people have had fitted. What have people had fitted from cats back?

Thanks

[Ian Simmonds]

I've had a look on ebay but can't see anything reasonably priced. Is the RS4 exhaust a straight bolt on or does it require some modification? If so, what's involved?

Does anyone have any comments regarding the pipe reduction and possible flow restrictions?

Also, anyone with a 3" system got any suggestions. I was told that the issue was getting the boxes to fit without having issues with ground clearance. I'd be interested to see photos of any systems people have had fitted. What have people had fitted from cats back?

Thanks

Ours is a 3" Milltek twin box and cat from the manifold back.... Never had a ground clearance or knocking issue caused by the exhaust. Not sure why they're saying it has to be 2.5"

[Alistair E]

They said the boxes they would fit with 3" pipe would be too large a diameter and would cause ground clearance issues. The pipe isn't a problem.

Question is, given that the existing pipe is 2.75", would reducing the diameter to 2.5" after the cats make a difference. I'm no expert on exhaust flows but I've read that the further back in the system, the less effect the diameter reduction has.

[Kiku]

Have seen S2 with 2x 76mm pipes going UNDER the rear subframe. Clearance, no problem. You shold be ok i think.

[M_GORDON]

Well...
In the past I've a Supersprint 70mm DP before the OE exhaust; and the lag and the turbo pressure wasn't on good paremeters.
Now with the 200cells cat (only one) and the intermed and final muffler, the engine work better. I don't understand how you can goes with 76mm DP and catbacks.


PS. mine's are ugly too and I don't now who mount: Supersprint, RS4, Jettex, etc.

[RS2junkie]

Hi,

Have a 3" Milltek with single CAT and 3" DP on my RS2, great sound, and useful power increase... no ground clearance problems although the fitters needed to take their time..
P

[Alistair E]

Not looking to change the front end if I can help it, too much expense. Just looking for the best option from cats back.

[Christophski]

Just make sure the car isn't lowered and the exhaust fits well and you will be fine. My avant is lowered and the ss standard size exhaust catches every now and then. I'm going to change it for a 3" system eventually that fits right and then hope I don't get clearance issues. I guess that's what lowering does though

[newsh]

I think my RS4 system is still at QC. If you want to go and get it you can have it for free.

I've had a look on ebay but can't see anything reasonably priced. Is the RS4 exhaust a straight bolt on or does it require some modification? If so, what's involved?

Does anyone have any comments regarding the pipe reduction and possible flow restrictions?

Also, anyone with a 3" system got any suggestions. I was told that the issue was getting the boxes to fit without having issues with ground clearance. I'd be interested to see photos of any systems people have had fitted. What have people had fitted from cats back?

Thanks

[Jonas_R]

Jetex sell a 3" catback system

[Alistair E]

While I've been looking around I've seen Jetex systems advertised. Any feedback on what they're like?

[Jonas_R]

I have one for my avant not fitted yet but quality looks Good.

I had One fitted to my a6 avant 2.7t and quality and sound was good.

[M_GORDON]

And the Jettex have any inscription on it? I talking about for the MOT