[andrewb70]

Originally Posted by conester2013

So does this replace the standard GM harness and ECU for an LS3 engine then? I'm going LS3 at the end of the year and the harnesses from GM performance are $1300...if this is $1K and has more, then I might go this route!

If you never plan to modify the engine, than the GM kits are plug and play. However, if you think you'll change things down the road, the Holley system will give you more flexibility.

Andrew