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I believe the consensus is that for tuning the N20 X1's, the JB4 is the best off-the-shelf tuner. Dinan had a tune out for the E-chassis N20, but is no longer available. MHD and bootMod also aren't available for our 4 cylinder E84s.
Any kind of tune will be pushing the N20 towards the material limits of the engine. Metal charge pipes, an intercooler, a downpipe, and the tune will run a user at least $1500 to make 350WHP. Any more power requires forged internals, and that just isn't cost effective.
On the other hand, going to Map 2 and running 20 PSI can be a lot of fun. A 3500 lb car with 300 HP and AWD is probably faster than most people have ever experienced.
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