I am installing an A`pexi N1 Catback Exhaust System on my 92 Civic DX, and I was wondering if anyone had any tips regarding the install. I am having a tough time with removing the stock exhaust, especially down by the cat converter. The bolts holding it in will just not come off. I sprayed it down twice with some penetrating lubricant, but it still won't budge. Any tips would be greatly appreciated.