OK hi i own a 91ef with a b8 in it d15 1.5liter its so weak i just have a intake and apexi n1 exhuast gutted cat i was wondering if i putt a z6 head on it what would be the results on it in hp since it only has like 70 what causes it to make so low hp and more TQ.. I really dont care that its slow right now working on body work rigt now but just a little bit of pepp would be nice prolly going 2 stay sohc.. so iunno just get back 2 me later...

 

As I had the b8 myself, I believe it is the small intake manifold restricting air, and the extremely small exhaust manifold. Changing the head would do quite a bit for that I believe.

 

ok so a si full mani upgrade ecu and alll with nice headers and a z6 would pepp it up some?.. 1 question how do i remove rear seats 91 ef??

 

Bottom of the seat just pops out, some metal slides out on the bottom. As for the top I believe there might be some bolts on the bottom near the point where it folds. I would just do a swap though, unless you have the parts. Do a full z6 or y8 swap or something