i've installed it in my 96 integra gsr. it wasnt that hard (the only hard part was climbing underneath and working in small quarters using jackstands). i took off my old exhaust, and lined it up with the greddy one and matched the bend in the pipes.

here's a helpfull hint...
spray wd-40 on the nuts and bolts and let it soak in for a while. it'll make it easier to undo them.

also use a box or a jackstand to hold up the catalytic converter while uninstalling the old muffler so you wont bend your exhaust headers or rip your o2 sensor wires out.

also the greddy exhaust end was a bit short with my rear body kit on. so i had to go to a muffler shop and they extended the pipe (before the muffler). i think it only costed around $50 for the job.

hope this helped.