| Assuming were talking about the TD04-13G (this is the turbo used on automatic DSMs, the manual uses a TD05H-14b), its a pretty small turbo. It will be comparable to the Sport 500, maybe a bit smaller. The TD04 will last a very long time and is engineered well, but so is the Sport 500s and you can still find Sport 500s for sale at many vendors for ~$1900. The Sport 500 might have a bit more power potential but I think yoru determining factor should be price. How much does the TD04 kit cost?
Here is a link for a TD04-13G compressor map as well as tons of info on how to read it:
[ http://www.stealth316.com/2-3s-compflowmaps.htm ] Scroll down, its towards the bottom. There shoudl also be maps for the 9b, which is what the VR-4s come with stock.
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