my question is will the stock ls exhoust manny, downpipe, and flange fit on a GSR head and cat back. im pretty sure the manny fits right up but i dont know about the down pip length or if the flange will fit the cat.

i ask because i need to get my car smoged and i need to set it back to stock and i can only find the ls exhoust on ebay.

thank you.

 

If it is an 00-01 GSR, yes. Otherwise, it will be a few inches too long where it meets the cat.