Are air boxes (where the air filter goes) on the 86-88 interchangeable between the NA and turboII ?

thanks,
hugues -

 

I'm not sure, but you probably should eliminate the stock air box anyway. Replace it with a cone-type air filter surrounded by a nice, custom made cold air box. It will be an improvement in terms of engine longevity and performance since it's recognized that the FC's stock air box is somewhat restrictive. It's an inexpensive mod and usually the first thing many FC owners do.

Have a look at this thread...

Cold Air Box

 

Should be no problem as long as you stick with the same series. Series 4 will not work on series 5 or vise versa.