Zmanco Posted March 27, 2007 Share Posted March 27, 2007 I can see that the early FI intake manifolds without EGR are much cleaner looking than the later ones. As I have an '80 intake, I'm wondering if the 75-78 have any performance benefits as well, or if it's all just apperance. If I switch to FI, I'll be puting a 60 mm TB on it, so I'm just trying to isolate the difference in performance from the intake. Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted March 27, 2007 Administrators Share Posted March 27, 2007 No performance gain in the earlier intakes over the later N/A intakes. The port runner ID is the same on all the N/A EFI intakes. The Turbo intake manifolds have an ever so “slightly†larger runner id, (at least the ones I have measured side by side to N/A manifolds though there are a few members on here that swear not all turbo intakes are the larger runner, which I can’t disprove), and it is still up for debate whether that slight increase in runner diameter is of a substantial enough increase to justify its less than aesthetic appearance. The only other real difference in OE EFI manifolds was plenum volume. The earlier intakes and Turbo intakes have a larger plenum than the later manifolds. It is generally accepted that there is no difference in power output between ANY of them. Hope that helps. Quote Link to comment Share on other sites More sharing options...
Zmanco Posted March 27, 2007 Author Share Posted March 27, 2007 Thanks Paul, you confirmed what I suspected, that it's about how it looks Quote Link to comment Share on other sites More sharing options...
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