i have a slight problem i ran into. Im dropping a jdm b16 obd0 in my 90' hatch It'll come with the factory manifold on it, which is 2.25", but I ordered a Tanabe Medallion touring exhaust (2.5") for it, and I was going to get a 2.5" test pipe since I have no cat to put on it and I plan to get a header in the near future. So what exactly would I need to make the 2.5" test pipe adapt to the 2.25" manifold? Thats all i have really left for my swap so I'm stuck here! lol
has anybody had the same problem? Please Help!!!!

 

You need to take it to a muffler shop.