What is your single, favorite mod?

Honda_RacerX

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Thats a tough one, but if i had to pick 1 mod it would be the lowering springs. Without them on, no matter what else you do to your si it will always slighly resemble a lifted hot rod.

The stock wheel gap isnt as bad as the stock wheel gap of tue 9th gen si, but it still isnt great.
 

repeet

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Stiffer rear motor mount. Without it, the engine flops around too much to feel sporty or precise.
 


EkSean

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Ktuner for sure
 

gtman

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Ktuner with TSP Stage 1 tune.
 

FLOPPER

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Flex fuel.
 


Ziaro7

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Changing out the transmission fluid with synchomesh fluid has been the one I generally recommend to others the most, other wise Ktuner TSP1.
 

amxandy

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If anyone is NOT putting a KTuner on this list, it is because they haven't tried it. A KTuner is, without a doubt, the best bang for your buck.
 

NoKz

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If I had to choose 1, I'd say KTuner with (at a minimum) the TSP Stage 1 tune. I love every mod done to my car. They all work so well with each other and she sounds/feels like a beast.
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