hptuner or efilive
For more information on both this is a great place to start https://ls1tech.com/forums/pcm-diagnostics-tuning/368718-read-me-best-ls1-tuning-software-best-scanner-best-handheld.html
I was an HP Tuners user for several years before working for them and couldn't be happier with the product and now being on the customer support side of things they now have some of the best product support in the industry

If you decide to go with EFI, Give us a call we can make you a good deal on EFI Live and a wideband as a package
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EFI Live + Roadrunner is a much better RTT tool, but its expensive
HP Tuners has RTT for alot cheaper, but its very limited compared to the roadrunner
It really depends on the user, if you are only looking to tune your car and do basic stuff, HP tuner's RTT is probably fine for you
If you are pushing the envelope and doing alot of testing/cutting edge tuning, the roadrunner in my opinion is the only way to go.
http://www.thetuningdoctor.com/HPTun...stomsized.html
In the end they are both very capable tuning software packages with or without real time tuning, only ours costs less up front & gives you more vehicle licenses(up to 4 LS1 style) with your initial purchase.



