Wow really, common guys use search before posting, it helps a lot.
The N54B30 is unchanged between the 135 and the 1M, they both use the same Mitsubishi TD03 turbos.
Don't buy ASR. They are a highly shady company. Look at the big thread on N54tuning.
RB and RD turbos are the best options right now. You'll be running 500WHP all day.
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