AO Gold Member
Join Date: May 2009
Location: South Africa
Yes the easiest will be to get a 3.0 and put it in the 156. The early 156 2.5 in my opinion is a nicer car to play with since the electronics are not as integrated.
If you want to stay with a 2.5 start with the following.
Since it’s a early 2.5 it will be fitted with the proper outlet branches.
Replace the inlet runners with the 45mm units from a 3.0 or 3.2 and match the base with them.
Do a proper service.
Improve the inlet track so that it can breathe a bit easier. K&N drop in filter, GTA inlet trumpet and replace the standard pipe between the MAF and Butterfly with a silicon and stainless pipe system.
Replace the exhaust with something that flows better and are proven.
Now you can replace the cams with GTA inlets or something a bit more aggressive if you want.
Difficult to say where the power will be by now but you would have gained enough to feel the difference.
GTV V6 Turbo, Q2, Eibach, Koni, and lots more
916 2.0 Spider what have I done
Triumph Trophy 1200 to counter the fuel prices.