My friend, what you have observed is true. I booked an Altis 1.6 last year and got it within 24 days. A few weeks ago, while collecting the documents of my car, the dealer told me the very same Altis 1.6 was available on 4-5 month booking then, same as GLI Manual, where as 1.8 variants were available within one month. If there were production issues, IMC should have also dragged delivery period of 1.8 variants as well, which isn't the case. So, to me, it seems a ploy to sell as much 1.8 variants as possible before the launch of Civic X, Just my two cents.