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Mar 18, 2026
8
1
Im starting to gather some parts for my swap to convert my 2004 leon cupra AUQ from a k03s to a k04.

The engine has had all preventative and age related maintenance done, and is pretty much a virgin engine except for a n249 delete.

Ive currently managed to aquire two healthy k04 turbos and a 80mm K and N cone filter for £25 (practically daylight robbery)

I believe I need the following:

Turbo inlet pipe
Front mounted intercooler and pipes
BAM injectors
Downpipe compatible with K04 ( i need advice on this, ive already got an aftermarket downpipe, do i get a new one or fabricate my existing one?)

If anyone can recommend what to look out for, or what parts to buy (new or used) that would be appreciated.

Cheers


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