Living la vida loca!
AO Silver Member
Join Date: Jul 2005
Re: Intake Runners
Not sure about the 155 but the only difference between the 164 QV 24V and the standard 24V Super was the intake runners. The Super had 39mm and the QV had 45mm (if memory serves). The extra horsepower gain was 20 BHP from 210 to 230 BHP. Basically the engine was designed for the larger runners but was constricted on the Super in order to give the QV an edge and therefore a reason to buy one! I'm waiting for my runners from Italy as we speak/type. That in combination with a chip and the sports filter I have is good for 240 to 245 BHP (tested). Oh and the exhaust needs to be done too as what you do at the front you've got to do at the rear or there's no gain.
I know that the 156 can have larger runners and I believe the performance increase is good but I don't know if you can do the same to your 12V 155 engine. I really doubt it but try anyway, not a big job and you will see right away on the first runner you remove.
164 V6 24v "Zender Alfa Sport"
Past glories: Sud 1.5ti, Alfetta GTV, GTV6, 33 1.5ti, 33 1.7ie, 164 3.0 V6, 164 3.0 V6, GTV 1.8TS, 156 1.6 TS, 159 2.4 JTDm QTronic.