I've used them, and they are one of the most useful tuning tools for the DIY'er. I have seen a few on VR6's, but since most people have the work already done for them in chips and EPROMS, I can understand why most people don't use this. You can pay a little extra to have your software reburned for something hundreds of people have done before you, and with a guarantee it works.
Im sure G-man can come up with something, if it's got Bosch on it he can probably tune something accordingly. I'm sure since he works with higher output engines, he's got some maps for larger injectors.
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