Quote:
Originally Posted by wcs531
Assuming either the engine internals, transmission, or differential don't just give up with more power, I think its just lack of development. Because there are somewhat significant differences from the S63 to the S63TU, they cant just slap a tune on one from another. The N54 took years to keep pushing the boundaries further and there were multiple tuners all gunning for more hp.
Ultimately, the number of paying customers trying to get 600+whp on an e70 X5m or e71 X6m are too limited to justify the R&D costs for a shop since the S63 hit end of life as soon as the S63TU came out. I dont have the sales figures for those two models but I bet the f10 M5 outsold the X5M/X6M by a decent margin, plus I bet a larger percentage of owners would tune them.
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This is a very valid point. I can find anything and everything for the S63TU, but S63 is few and far between, and expensive as hell in comparison. Hell, a canned tune is asked to be upwards of 1-2k, when every other car I've ever modified would range between 450-650 for a fully custom setup. 1800 bucks for a downpipes? Pffft, my Z06 exhaust cost less for headers, x-pipe, intake, pulley and tune.