LS and GS-R

if your not shure weather you have a gsr or a ls you definitly could check your vin# and compare it to other gsr and ls on ebay or whatever to find out wich you have, bnut because they didnt make a gsr with no vtec im goin to bet on the ls. also you definitly dont need to take the engine out to replace the headers, im not shure when they changed the engines but i know that in the early models the intake manifold was twards the rear of the car and the header was near the front wich would make it easy to remove,wich they spun around in later models, you might need to take out the radiator if you find there isnt enough space to move around. also you dont need to try to fit any gsr parts to your ls cause they definitly make plenty of parts for the ls.