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Hi guys, I have an 03 sonic yellow that I recently picked up from copart as my latest rebuild after getting it home and starting the car I noticed it smoked so I pulled plugs and ran a compression test and it has 145 psi in 1 and 3 and 95 in 2 and 4 what could cause this bad head gasket,ring land, valve issue. Car is an 03 with 161k miles has cated down pipe 3 inch car back sylicon inlet and Mishimoto intercooler. any help would be very much appreciated before I tear into this thing.
 

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If both cylinders are low I would venture to assume head gasket.
Best way to determine now is a leak down test. If you air coming out the plug hole on the adjoining cylinder then you know your head gasket is leaking from cylinder to cylinder.
 
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