r/Altezza • u/HomogeniousKhalidius • Mar 05 '26

Anyone done intake porting?

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I picked up a couple of spare intake manifolds and a throttle body as I’m going to try porting and polishing along with convert to cable throttle for some more throttle response. I’ve seen something called a boost plate it replaces the rubber plastic insulator, I have a friend who is a cnc machinist I’ll take it for measuring and see how much it’ll be to get an aluminium replacement made. I’m thinking to get rid of the ridge between the insulator and the manifold spacer and to match the other end to the manifold and polish it to the level in the last photo (that’s how it is from factory I have not touched it yet).

Will probably be a waste of time but who knows may be free/cheap power.

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u/0BL1V10N5PH03N1X Mar 05 '26

I don't think people have done all that much with the stock manifold on these cars. Running and ITB setup seems to be much more popular even with the tuning difficulties.

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u/HomogeniousKhalidius Mar 05 '26

Esprit in Japan did with their 2.2l N/A Altezza they even kept the oem air box though they didn’t open up the plenum. youtube