I am about to order the buschur 2.5 inch downpipe. I have the Apex N1 exhuast. I also have a 2.5 inch test pipe that hasnt been put on yet. My question is: The Apex has that adaptor thing, will that be a problem with bolting up the test pipe and downpipe since there is that little space where the adaptor was? I wouldnt want to keep that on since I would think it would be very restrictive since its the same size as the stock pipe.