An intercooler won't do anything but act as a restriction in the intake tract of a car that doesn't have a turbo or supercharger.
They are used to cool the charge as it exits the compressor (compressing air in a turbo makes it very hot and hot air is bad in terms of O2 density and detonation etc) in these apps and have no function in normally aspirated cars.
If you've got a turbo/super on your LS, I've heard that Spearco makes a good FMIC that'll fit, though the name/partnumber escapes me at the moment.
I want to know about the first gen, if there is an intercooler upgrade. I have one i got for dirt cheep and it is every bit as fast as my slightly modified mx6 ls. I have looked and looked for an intercooler and downpipe upgrades and came up with nothing
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