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What is the difference between the EX engine and the LX/DX engine?
Is it only the head with all its components?I want to know because Im going to buy some aftermarket parts and if I make the head swap I want to put the correct parts.

 
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Basically, ECU is programed totally different. for EX.

 
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Exhaust manifold is shorter on an EX and the cat is under the car. LX has a cat built into it. The compression ratio is different EX=9.9, LX=9.5. Trannys are a little different too. Thats all I can think of besides whats already metioned.

 
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Okay...so far yall have missed the biggest difference--an EX has a VTEC engine and an LX has the non-VTEC engine. There is a significant difference between the two engines. The non-VTEC engine is a total dog and it is a complete waste of time trying to build it up.

Also, regarding the non-VTEC engine there is a big difference in performance between the 5 spd and the auto. The auto is a complete dog. I have an '04 with an 5 spd and my wifey has an '05 with an auto. Her car is SLOW!!! Not that mine is fast...cuz it is not...but I definitely have more power at the wheels than her. In other words, auto's lose a lot of power through the drivetrain.

 
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i thought VTEC was a given.

 
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Should be, but in case it wasn't I wanted to ensure everyone understood this subtle difference. LOL!

 
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It is fairly subtle. The VTEC on an EX is pretty worthless for power.

 
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True that! Makes what--145 hp at the fly? That is better than 115 hp though! Plus, the VTEC engine is a better platform for building the engine than the non-VTEC. Best thing to do though is a K20A2 or K20Z1 swap--that's what I am in the process of doing!

 
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what does an auto tranny compared to 5 speed have to do with differences in EX and LX? lol.

 
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quick silver, how is the vtec engine a "better platform" for building the engine when you say u plan on doing an engine swap anyway.. and what is a k20z1?

the non vtec engine has lower compression which is supposedly better for forced induction such as turbo..

and also there is not a big enough difference between the power of the two engines to make it substantial. (Feels to be like the non-vtec has a lil bit more torque) but this is just my opinion and what i think so dont count me on all this

 
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k20z1 = 05 rsx type s

lx is better for turbo. change the lx head into ex and then turbo it.

 
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127 hp for manual. Probably 100 hp at the wheels for automatic ex and 95hp for automatic lx/dx

 
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Less than 100 at the wheels. Gearbox did less than 100 with his auto and some substantial mods.

 
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Had nothing to do with his original question. However, after I answer his original question I provided that info as a side-note.

 
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VTEC RULES......Its like a mini turbo in my pants .....

 
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feel dat boost! go vr00m

 
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OK. Lets see if I understood. If I put an EX head (vtec) and an EX ECU on my engine, it becomes an EX engine?

 
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^I think you need the VTEC selenoid too?? Or it comes with the head?

 
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Should come with the head. And I don't think you need an EX ECU.

 
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I need a VAFC2 and the head. If I make this swap, does it will be good to buy EX headers and intake? or just keep using LX/DX parts?

 
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how bout not swapping to vtech, maybe just run 1 two barrel weber carburetor, or better yet two weber carburetors, if your car doesn't have to be smogged that would add a lot of oomph.

 
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compression