ko3s or ko4?

[Mi11ar]

I've seen this sort of thread before but couldn't find it so asking the question, ko3s or ko4 for my 1999 A3 1.8T, am I right in believing that Ko3s is a simple swap for the ko3 and the ko4 requires internals and the rest of it?

What are the Pros and Conns?

 

[Vex182]

K03s is a straight swap, k04 requires more: different inlet, exhaust manifold, larger injectors needed etc.

 

[Mi11ar]

Exactly the sort of answer I was asking for cheers

 

[Vex182]

No problem. I am sure others that have done the conventions can give you some more in depth advice and will be along soon.

 

[Tim_Attard]

also need a new down pipe too, stick to the ko3s mate u can get a good 230-240 from it if healthy