if you wanna hold on about 2 weeks or so i'll have my emanage for sale, wires etc etc send me a PM if your interested. its a laptop tuner, it has alot more fuel parameters than the Vafc's BUT it doesn't do the Vtec thing which by the looks of it your LS doesn't have so if your interested in going that route i'll cut ya a good deal on it. but if not i'd say invest in a VAFC and use the AF part of it right now then when you boost on the GSR you can use the Vtec engagement part of it. so its really up to you but if you're looking to save some cash now and get something with a better... "air/fuel mapping area with closer details Emanage, if your looking for basic AF duties and Vtec later on get the Vafc"