RJC was a Good Choice. I am in the process of installing a GN1 3" downpipe, dump and exhaust. The fit has a lot to be desired. The tailpipe on the passenger side is hitting the coil spring. When I move it to clear the coil spring the muffler and pipe hit the driveshaft. The slant cut on the passenger side tailpipe is crooked. Driver side is O.K.
I will say the downpipe fits nice. Bolting the collector to the test pipe looks like it may be a challenge since they are not flush across the flange. And the test pipe which is supposed to slip on the downpipe tight and not need a clamp is so loose it hangs down. A clamp will definately be necessary. BUT I'm sure I paid a lot less than you did for the RJC.....