ive installed many turbo and SC kits, and in my opinion HKS is by far the best for many reasons. let me list the ways.
1. fitment is great. small amount or no molestation to the chassis and body parts. some kits require you to cut this, notch that, whole saw here..... who wants to cut up their brand new car. they also cast alot of intercooler piping pieces to fit into small areas. this reduces the number of intercooler pipe and silecone couplers you have to use (less chance of one poping off).
2. parts last very long. Most of the SC brackets are casted with supports in them to reduce vibration. this will in long term extend the life of bearings and belts.
3. although their bolt-on kits arent rated at high hp, the power band is very strong. so if your daily driving it feels like twice the ponies
4. all hardware included in their kits are top notch. fitting are usually steel, not brass pluming ones from the hardware store(that some companies use. rubber hoses and vacuum line have a thick wall thickness so they dont bind around tight spaces. oil feed and return lines are made specific for every application, some companies provide you with 2 fittings and 10ft of coolant hose and have you make them your self.
5. install is straight foward with good instructions(lots of pictures)
6. never have to remove AC or PS
7. quality control is great! never parts missing or broken.
all in all, if your looking for a FI kit to get with the least amount of headaches, HKS is the way to go. the extra money spent is worth it
here is an example of the HKS Nissan 350Z and Honda CRZ kit.
