I just recently swapped a jdm turbo engine + 5sp tranny into my 89 FC, which was an automatic,non turbo when I bought it last year. So obviously I need to change some **** around.

I wanna buy a HKS downpipe 75mm, compatible with stock and sport turbos. But I would have to modify the flange on the stock main cat. That's what it says on ebay.

Now what I wanna know is if I were to buy this downpipe, would it be compatible with the exhaust system I have now. And the exhaust I have now, I doubt it's stock, cause it dont look the same compared to the shop manual. In the manual it shows a main cat a y pipe and 2 mufflers. What I have is 2 mufflers, 2 ressonators and pipes that are welded to the back of the cat. It's a bosal exhaust. If it's possible does anyone know where I can get a flange mod for my cat from a 3" to a 2 & a 1/4 inch? Or should I buy a complete new exhaust system, downpipe and cat.conv. all seperately since almost no one sells their exhaust systems this way, meaning complete ?

What to do, what to do ?

 

I hope no one is ignoring me. I realy could use someone's advise or expertise on this.