Yes it is the same care just one is hatchback
11.5 gallons Added: Actually, my 2000 Honda Civic DX Hatchback has a 11.9 gallon capacity.
Yes as long as they are both the same body style (coupes, hatchback's, or sedans).
a hood from a 1999 civic will only fit a 1999 or 2000 civic, and for the 1993, you should be able to use any hood from a 92-95 civic, of the same style (ex. coupe fits coupe, sedan to sedan, and hatchback to hatchback, though I believe hatchback and coupe use the same hood)
According to sizemytires.com, the original tire size on a 1990 Honda Civic (with hatchback) should be either 165/ 70R13 or 175/70R13. Meanwhile, the SI Hatchback lists at 185/60R14, and the EX Sedan lists at 175/65R14.
The same parts and systems can be used to repair the exhaust on both a 2001 Honda Civic LX and 2001 Honda Civic EX. Both versions of the Honda Civic require a cat-back system.
if they are the same generation almost all parts will be interchangeable, but they have differrent engines and some accessories.
FROM THE HONDA DEALERSHIP PARTS DEPARTMENT.
Yes.
I assume you are talking about a 1996-2000 Civic EX and a 1999-2000 Civic Si. If so then yes, people do it all the time and practically every part will fit and work on your EX model, especially if you have a 1999-2000 Civic EX. Interior/exterior pieces, suspension, engine parts, etc. That's the great thing about hondas.
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There are various sizes depending on which trim level on 1993 Honda Civics:Civic CX or VX Hatchback--165/70/13Civic DX Hatchback or Sedan--175/70/13Civic EX Coupe or Si Hatchback--185/60/14Civic LX Sedan--175/70/13Civic EX Sedan--175/65/14