JB4 is nice for plug and play, hopefully keeping warranty intact, but if you want to up the power, i suggest APR tune. They sell one with an APR warranty on the mechanicals, its based on the 87 octane stage 1 tune. So that is the tune they consider to be safe to the point they warranty the engine and turbo under APR Plus (999.00?). Or the 87 octane stage 1 tune is 649 without warranty. I went with their base tune that also supports the GTI turbo, and it has way more power than a front wheel drive golf should. I want for that AWD and the 6 speed gearbox.