Allright so you want to look into the JR supercharger for your R18?
Well, first off do you have an AT or Manual?
I had emailed JR quite a while ago so it may be worth asking them again but from what I remember the regular base version will fit either car easily. The track pack is the one that comes with an intercooler. The kit for the AT does not include the intercooler as the transmission sticks out too far and they couldn't run the pipes easily enough. So the AT cars are limited to the 65hp base kit. Both kits come with upgraded injectors. This may have changed. The base kit was built around all stock parts as well so you don't have to upgrade anything to get that power bump. That said, AT R18's usually dyno around 110-115hp at the wheels so with the 65hp increase you end up around 170-180hp at the wheels, from the dyno charts I've seen, which is stock Si territory.
The TIY kit means you have to buy flash pro and new injectors yourself and get someone to tune the car for you.
The factory tune means they send you a locked tune and upgraded injectors. I can't remember exactly but I think you have to send in your ECU and they flash a tune onto it for you. It's a very safe tune and should give you tons of trouble free miles.
The "track" package came with a very aggressive tune and an intercooler. The IC does not fit the AT cars from what I remember.
The 06-11 and 2012+ R18 motors are almost identical. There is a little difference in the mounts, oil pan, and the front crash beam since the hood/grill/lights/design of the car is different. That said, the base kit should bolt right up without issue. It's possible that the crash bar in front would need to be trimmed to fit the rotrex unit but I don't know for certain. You could possibly just need to notch the beam where the blower is and the piping might just clear the rest.
I believe the reason JR won't say it fits a 9th gen is because they have not personally test fit the system on a 2012+ car. Also flash pro took so long to come out for the non-Si 2012+ cars and their sales of R18 kits were so low anyways, they didn't put the time into test fitting it. They do like to sell a kit that doesn't require any custom fabrication and I don't blame them.
The main reason people shy away from this kit is that the cost to upgrade is usually close to the cost of trading in & putting the $5k of supercharger money towards an Si. I was going to get one but it ended up costing more to do the SC kit than to trade up to a different car. Not trying to talk you out of it but you will need more than the kit alone to get what you want out of the SC kit. If you start making a ton more power, you're going to need better tires and suspension to put that power down and not just spin the wheels. The SI comes with an LSD and the R18 does not, so that power can easily just be put into tire smoke.
Example:
I put in a 2013 Civic EX Sedan into KBB with 75,000 miles and very good condition:
Trade in value is around $8500 and selling private party sale is around $10k.
http://www.kbb.com/honda/civic/2013...=75000&pricetype=trade-in&condition=very-good
2012/13 SI cars with between 40-60,000 miles are on carmax, which is always priced high, for around $15,000.
Here is a 2012 Si with 40,000 miles for $15,600
https://www.carmax.com/cars/honda/civic/2012/13730458
If you sold your car for $10k and had the $5k of supercharger money, you could potentially trade in for a car with less miles and all the upgrades including the power you want. So, even if you trade in for let's say $9k, you are still within $1-2k of the Si price vs putting the supercharger on your car. You could certainly find a 12/13 Si for less than what carmax has, they are just always high so it gives a good reference point as far as values go. Unless you have to have an automatic, then the Si is of course not an option.
Have you done anything performance wise to your car yet? Other than cosmetic stuff? I would highly suggest looking into a few choice mods first that can really transform the car before going full on SC kit.
