okay first of all the S13 had both a Red and a Black top so your confuzing me with what exactly it is your asking for. You also mention the s14 Black top i think in another post??
But here goes, installation for any SR is basicly the same thing so it wont be anymore dificult installing a S13redtop or a S14 SR.
Prices is in the FAQ and every where else in this forum so i wont go over that, but alot of ppl recamend getting the Redtop purly for the fact that its cheaper then the others, and with the extra money lefted over you could mod it and have more HP then the newer and more expensive motors. So it realy is up to you, I on the other hand would not get a Redtop because i dont like the color red (stuped reason but hey my money) but depending on how much money i got i might consider it and just repaint the cover. Mod it to what ever desired power i want and there you go.
There realy is no reason to get the higher SR's exept for the bragging rights. witch isnt a bad thing ether, but you can also just Turbo your KA. You said you just baught your 240 and your already thinking about motor swaps and such. Dont tell me thats the sole reason for getting your 240... even if it is deny it at all cost here... OR ELSE...
But if that is the only reason then good luck...
BTW you also mentioned its gona be just for track?? what type of track Im not sure your gona do much good raceing with an SR, perhaps an RB or go KA-T. i dont know... ignor me
