i have a 2dr 99 gsr. i recently purcahsed a jdm itr header along with carsound cat. i wasnt too sure of size cat i needed so kteller just made it to his best estimate. he said its better to have it a little longer than shorter when it comes to cats. so after it was made and sent i found out its suppose to be 12 inches for my setup and it was actually made to be 13 and half from flange to flange..my question is is it possible to squeeze that extra inch and half in between a slot that is supposed to be 12?

 

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