Thanks, whats ko3 and ko4 are they turbos? Can r-tech do a good enough remap for 230 bhp. Cuz the bams are quite pricy like £1500 n the aum are like £400 so is it woth buying the bam as a base or spending the rest on aum?
k03, k03s and k04 are turbos that come as standard on 1.8t. bam's have the k04s. BAM go for around £1000, at least wen i was looking for them, and the others went for around £700.
If you want to run around 270bhp, then the BAM is the way forward. its quite a lot of hassle to make an AUM or similar k03/k03s engine produce that much.
i'd suggest getting an AUM or any 1.8t that runs a k03s and get it mapped, etc. what car are you putting it in? im putting mine in a mk3 and im running qpeng.com management. its big money, but the ecu comes ready mapped. if you havent thought about management, i'd check there website out, good stuff.
as for which engine. if you want to spend that much extra and get like 40bhp more then go for it. but if they are costing that much money, then dont do it.