ok i dont have that much money to spend on anything to make this work so what do i need to do?? i dont understand what the 3 bolt is supposed to bolt up too because aftermarket headers and downpipes have 2 bolt patterns too?? :?: im reallly confused as of now i just want an exhaust
i need help bad
OK, the original thing about the HF...the chassis are exactly the same. If you have any other CRX motor swapped in (d16a6, etc), you will be fine with whatever 88-91 exhaust you choose. The only issue, as far as I can guess, is that they say it doesn't fit the HF's STOCK manifold, which is short and has the catalytic convertor on it, so it wouldnt bolt up the same. If you have anything other than the stock HF engine and exhaust manifold, you should be fine.
The stock cat on any of these d-series motors has two-bolt flanges at the front and three-bolt at the back. The two-bolts have spring bolts. Your header, at the collector, should have a two-bolt flange. If you don't have a cat, and you are buying a cat-back exhaust, you will need a cat or a test pipe to fill the space between your header and your new exhaust. The cat-back won't bolt directly to your header, for more reasons than just the flanges.
Tell us what engine and header/manifold you have if you want specific advice...