VitViper
Well-Known Member
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Mucter is using an MDX airbox on his KW S/C 8th gen now -- it works very well. He was using a stock airbox for some time with that S/C and only lost ~10hp with it over the intake that comes with the kit.
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RTF is a paxed class and the Si is competitive in that class at G-Stock (with a decent driver that is hahahahha). G-Stock is really good, but at national events, everything with r-comps will likely own all street tire cars.But to answer your question, if you're looking to be competitive, I think that the best class for the civic si is actually g-stock, unless someone else here has experience with their car in other classes. Moving up to STX or DSP, there are a ton of cars that are very very quick when prepped for these classes.
If your car came from the factory or you bought it brand new with the HFP suspension then it can be in stock. If you just bought the package and put it on your car it is no longer in g-stock but STX. You can't modify any of the air intake except a drop in filter to stay in stock, this includes the resonator unfortunately. Also you can go as wide a tire as you want but the rims have to stay the same size and width as stock so that limits the width of tire you can put on the rim.
In stock the biggest things would be a big rear sway bar and endlinks, drop in filter and slightly wider/better tires (i.e. dunlop ZII, rivals etc. or r-comps if you really want)
Honestly for autox the stock power is just enough, handling is kind of lacking in stock form. So a big rear sway bar and better tires are all you need until you start to get faster, until then just drive your car and get as much seat time or take a school if you want.