Did the Bosch to Hitach MAF conversion, really simple and quick (adds great reliablity to those with 2000s and early 2001s). Also had to upgrade my ECU from B-Box to L-Box...then decided to go with Marc's K03 tune until the K04s get rebuilt (they dried up and fried(bad oil lines)). Marc's tune pulls much harder than the APR i had initially on K04s. All in all, extremely happy, got everything from Marc. hes been beyond helpful, and I look forward to more business with him.
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