im going to be installing a megan racing adjustable fpr on my 87 t2...i was wondering if it is ok to leave the stock fpr still inline or not and if it must be removed what i will need

 

I'd remove it, just get some fittings for the fuel rail. Or you might have to tap the rail for the threads, I'm not sure really, I'm still running the stock one. But I would at least remove the old one if your using a new aftermarket unit.