We oversize all of the bolt holes to allow for adjustment..... If you simply stick it on without looking it can be crooked. Every car is a little different and is why we oversize the bolt holes. Our system can be adjusted to be perfect on any Z. If you find one muffler sits a little higher then the other, Simply loosen the front of the x-pipe and rotate the X Pipe to get the two mufflers even. If you find the tips are crooked on one side, Simply loosen the muffler pipe connecting that muffler to the X-Pipe and rotate straight and hold while someone else tightens.
