Need help with exhaust

[rally]

I currently own a Audi A3 2007 1.6 petrol, I want to put on a s3 back box or exhaust.

want to know if it will fit straight on or do I need to do other stuff?

 

[prt57]

The whole exhaust will not fit as the S3 engine is totally different to the 1.6.
You have probably got 1 tail pipe showing whereas the S3 has 2. Is there enough space in your rear valance?
The 1.6 is fwd whereas the S3 is 4wd so the exhaust layout will be different.

 

[nluk100]

You can either buy a full cat back system designed for your car, or get a local exhaust shop to fabricate a rear box with whatever tailpipes you wants to fit your valance.

 

[rally]

The whole exhaust will not fit as the S3 engine is totally different to the 1.6.
You have probably got 1 tail pipe showing whereas the S3 has 2. Is there enough space in your rear valance?
The 1.6 is fwd whereas the S3 is 4wd so the exhaust layout will be different.

What if I just got the back box?

 

[prt57]

Have a look at a photo of an S3 backbox and compare it with your existing system. Are the hangers in the same place?
Also the diameter of the S3 pipework will be wider than the 1.6 so you would need a reducer.
It won’t improve performance by the way.