I searched the posts but I really couldn't find an answer to this. I just purchased a 2.5 inch cat-back system for my 89 LX and I got thinking if my stock H-pipe is 2.25 inches will this 2.5 system bolt to it? They sure do make it sound that way in all the ads. This is probably a dumb question but I just want to be prepared before I take my car apart. Thanks.