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Old 11-13-2012, 11:22 PM   #133
kenmar
3rd Gear Member
 
Join Date: Apr 2005
Location: Toronto
Posts: 326
My research from BimmerForums seems to indicate that TRM has the best tuning for normally aspirated engines; Turner has mediocre reviews. For OBD-I, the best combination I've seen for dyno results of 230-240 whp is for 21.5# injectors (apparently, it's more than adequate for N/A), 3.5" MAF on an S50 motor. I'm planning on ordering one of their chips this week for my S50 and will likely order a custom tune for my AA s/c.
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