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Now as for the part to increase performance, that’s all depends on your engine size & intake manifold size, it’s why there’s a lot of mix reviews, some swore by it and some feel no power gain… Example on k24z7, it’s 2400cc per revolution, if your intake manifold volume is smaller than 2400cc...

here are the facts about throttle body spacer… tb spacer it’s real name is plenum spacer, it’s main function is to increase the size of your intake manifold (air capacity), and depending on the spacer location, it can also increase intake runner length to add torque. 2 main locations to add...

in asia, 9th gen civic are available only in sedan platform, also, due to emission (annual cc penalty), the biggest engine available is 2.0 (R20) however in 2014, honda asia release a limited edition civic si sedan for some asian countries that uses LHD vehicles, it's pretty much a usdm 2013...

this is the reason why people stop coming to the forum, because of ignorant post like this, the website is already offline for 4yrs, go civicx and you will find all the accurate information. and not all forum are dead, go bmx museum, forum culture are alive & well, when it's running properly...

for those that wants to upgrade to oem underdrive pulley kit, these are the genuine honda underdrive pulley kit for 9th gen civic si, factory kit for k24y6 off 14-15 uae limited edition LHD civic si sedan in asia, it will not free up as much as aftermarket kit, but it will give you around 6hp...

This is the type of car with cross plane v8 engine that require harmonic balancer, not in an inline 4 engine… View: https://youtube.com/shorts/OtFZW_CB9Nk?feature=share

Good video to watch View: https://youtu.be/_-UtMAMm6K4

honda uses crank pulley, inline 4 engine do not have harmonic balancer... this is harmonic balancer.... it's a heavy rounded metal that add weight on the outside of the engine, mostly on v8, then you bolt the crank pulley to the harmonic balancer, this thing is a "counter weight", you don't put...

The thread is about no, they still do, just not on forums... the only reason i start posting on forum again is many have use google search and found my threads & reach out to me via Instagram. people still read it, just not interested in engagement, because of most people do not want to...

There is a reason I’m still in business and his not & took a job, the video teaches you how engineers cancel vibrations on inline 4 engine, it’s alot more complicated than a rubber band on a crank pulley.

This is a great video to understand more about inline 4 engine, if you believe inline 4 Have harmonic balancer & need harmonic balancer to cancel vibrations, you have to watch this video… View: https://youtu.be/82rxavW0A3c

Incorrect, only v8 runs harmonic balancer.

also available for 13-15 civic R18 sedan...

they are officially discontinued by honda... this is the genuine honda uae rear diffuser with rear fog/F1 brake light for 13-15 civic si sedan

How underdrive pulley makes power ? Engine accessories cause parasitic drag, it robs engine output away, it’s why when the ac is on, the car feels more sluggish, the alternator is charging, its creating drags…m when you upgrade ANY things that rotates (wheels, rotors, flywheel, cams, tires...

to cancel out secondary vibrations, if the engine is 2000cc or smaller, the secondary vibrations are minimal & with honda’s supreme engineering, it’s not need it at all, if the engine is 2000cc or larger, you use balance shaft oil pump to cancel out the secondary vibrations…. Balance shaft oil...

harmonic balancer is only found mostly on V8 engine, especially cross plane v8, why ? Because its low tech engine with very long crank that can’t be blue print & balance perfectly. so they added an external balancer as a band aid fix to cancel out the vibrations… honda inline 4 engines DO NOT...

here is a video to see ram air in action...