I decided to buy a Apex N1 for my B18b Civic HB. My question is should I get the exhuast for the HB or should I get one for the B18b? The piping is the same, but I'm sure the muffler and cat will be different. I don't want to have an extension welded onto a brand new exaust if I don't have to. So which one would be better to go with?