Hi. I got a obd1 b18b1 in 1999 civic ex coupe. I got spoon headers but it won't bolt up to the stock ex cat converter. It reaches it but won't bolt up cuz the holes where thr bolt goes don't match up. So does that mean I need an integra cat convertor?or should I just use a test pipe? And if I get a test pipe would I need one for an integra or civic? Suggestions? Help me please