use your stock harness. only thing that wont work is the reverse lockout, which you should already have that issue since u have the 6 spd in there already. or you could use an 02-04 type s harness if u really wanted.
you can get kpro on your stock ecu, but again there would be no reverse lockout. or you could get kpro on an 02-04 type s ecu if u want that function. you could also run a stock 02-04 type s ecu, you would just have to get the immobilizer matched to your key/car by the dealer. you could also use a jdm PRC ecu. the kpro is by far the best option though if u want to get the real potential out of the engine.
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