What To Do To A 05' Civic
#11
i would not get headers because they do absolutely nothing to our 7th generation civics also full exhaust will basically gain you maybe 5hp if your lucky which you wont evan notice . second you don't want a exhaust system bigger then 2.25 inches because you will actually loose low end tourqe because you will have no back pressure . so just get a nice cat back system thats not to loud something like tanabe hyper medallion.